Cannot create cross-controller relation sysbench/lxd->postgresql/microk8s: ERROR creating remote secret client: cannot resolve "controller-service.controller-m2k8s.svc.cluster.local"... i/o timeout

## Steps to reproduce
1. bootstrap lxd and microk8s controllers on the same client
2. deploy posrtgresql-k8s on microk8s (14/edge)
3. deploy sysbench on lxd
4. juju offer posrtgresql-k8s:database # on microk8s
5. juju consume microk8s:admin/mymodel.postgresql-k8s
6. juju relate sysbench postgresql-k8s

## Expected behavior
Succesful relation to workaround https://github.com/canonical/sysbench-operator/issues/37

## Actual behavior
```
ubuntu@juju340:~$ controller-0: 08:30:47 INFO juju.worker.firewaller start "sysbench:postgresql postgresql-k8s:database"
unit-sysbench-0: 08:30:48 INFO juju.worker.uniter.operation ran "postgresql-relation-created" hook (via hook dispatching script: dispatch)
unit-sysbench-0: 08:30:48 INFO juju.worker.uniter.operation ran "postgresql-relation-joined" hook (via hook dispatching script: dispatch)
unit-sysbench-0: 08:30:49 INFO juju.worker.uniter.operation ran "postgresql-relation-changed" hook (via hook dispatching script: dispatch)
controller-0: 08:30:52 INFO juju.worker.firewaller stopped "sysbench:postgresql postgresql-k8s:database", err: cannot open facade to remote model to publish network change: cannot resolve "controller-service.controller-mk8s.svc.cluster.local": lookup controller-service.controller-mk8s.svc.cluster.local: i/o timeout
controller-0: 08:30:52 INFO juju.worker.firewaller non-fatal error "sysbench:postgresql postgresql-k8s:database": cannot open facade to remote model to publish network change: cannot resolve "controller-service.controller-mk8s.svc.cluster.local": lookup controller-service.controller-mk8s.svc.cluster.local: i/o timeout
controller-0: 08:30:52 ERROR juju.worker.firewaller exited "sysbench:postgresql postgresql-k8s:database": cannot open facade to remote model to publish network change: cannot resolve "controller-service.controller-mk8s.svc.cluster.local": lookup controller-service.controller-mk8s.svc.cluster.local: i/o timeout
controller-0: 08:30:52 INFO juju.worker.firewaller restarting "sysbench:postgresql postgresql-k8s:database" in 1m0s
unit-sysbench-0: 08:30:52 ERROR unit.sysbench/0.juju-log postgresql:1: Uncaught exception while in charm code:
Traceback (most recent call last):
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 3022, in _run
result = subprocess.run(args, **kwargs) # type: ignore
File "/usr/lib/python3.10/subprocess.py", line 526, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '('/var/lib/juju/tools/unit-sysbench-0/secret-get', 'secret://77fe3914-0206-4d12-8735-32ebe4c82a49/corif6fmp25c760hv220', '--label', 'postgresql.1.user.secret', '--format=json')' returned non-zero exit status 1.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/var/lib/juju/agents/unit-sysbench-0/charm/./src/charm.py", line 325, in
main(SysbenchOperator)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 544, in main
manager.run()
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 520, in run
self._emit()
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 509, in _emit
_emit_charm_event(self.charm, self.dispatcher.event_name)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 143, in _emit_charm_event
event_to_emit.emit(*args, **kwargs)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/framework.py", line 352, in emit
framework._emit(event)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/framework.py", line 851, in _emit
self._reemit(event_path)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/framework.py", line 941, in _reemit
custom_handler(event)
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 2846, in _on_relation_changed_event
self.relation_data._register_secrets_to_relation(event.relation, diff.added)
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 1604, in _register_secrets_to_relation
self._register_secret_to_relation(
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 1590, in _register_secret_to_relation
CachedSecret(self._model, self.component, label, secret_id).meta
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 615, in meta
self._secret_meta = self._model.get_secret(id=self._secret_uri, label=self.label)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 280, in get_secret
content = self._backend.secret_get(id=id, label=label)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 3370, in secret_get
result = self._run('secret-get', *args, return_output=True, use_json=True)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 3024, in _run
raise ModelError(e.stderr) from e
ops.model.ModelError: ERROR creating remote secret client: cannot resolve "controller-service.controller-mk8s.svc.cluster.local": lookup controller-service.controller-mk8s.svc.cluster.local: i/o timeout
...

unit-sysbench-0: 08:31:06 ERROR juju.worker.uniter.operation hook "postgresql-relation-changed" (via hook dispatching script: dispatch) failed: exit status 1
unit-sysbench-0: 08:31:06 INFO juju.worker.uniter awaiting error resolution for "relation-changed" hook
unit-sysbench-0: 08:31:16 INFO juju.worker.uniter awaiting error resolution for "relation-changed" hook
unit-sysbench-0: 08:31:16 ERROR unit.sysbench/0.juju-log postgresql:1: Uncaught exception while in charm code:
Traceback (most recent call last):
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 3022, in _run
result = subprocess.run(args, **kwargs) # type: ignore
File "/usr/lib/python3.10/subprocess.py", line 526, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '('/var/lib/juju/tools/unit-sysbench-0/secret-get', 'secret://77fe3914-0206-4d12-8735-32ebe4c82a49/corif6fmp25c760hv220', '--label', 'postgresql.1.user.secret', '--format=json')' returned non-zero exit status 1.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/var/lib/juju/agents/unit-sysbench-0/charm/./src/charm.py", line 325, in
main(SysbenchOperator)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 544, in main
manager.run()
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 520, in run
self._emit()
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 509, in _emit
_emit_charm_event(self.charm, self.dispatcher.event_name)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/main.py", line 143, in _emit_charm_event
event_to_emit.emit(*args, **kwargs)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/framework.py", line 352, in emit
framework._emit(event)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/framework.py", line 851, in _emit
self._reemit(event_path)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/framework.py", line 941, in _reemit
custom_handler(event)
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 2846, in _on_relation_changed_event
self.relation_data._register_secrets_to_relation(event.relation, diff.added)
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 1604, in _register_secrets_to_relation
self._register_secret_to_relation(
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 1590, in _register_secret_to_relation
CachedSecret(self._model, self.component, label, secret_id).meta
File "/var/lib/juju/agents/unit-sysbench-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 615, in meta
self._secret_meta = self._model.get_secret(id=self._secret_uri, label=self.label)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 280, in get_secret
content = self._backend.secret_get(id=id, label=label)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 3370, in secret_get
result = self._run('secret-get', *args, return_output=True, use_json=True)
File "/var/lib/juju/agents/unit-sysbench-0/charm/venv/ops/model.py", line 3024, in _run
raise ModelError(e.stderr) from e
ops.model.ModelError: ERROR getting cluster client: unable to determine legacy status for namespace "test59": Get "https://127.0.0.1:16443/api/v1/namespaces/test59": dial tcp 127.0.0.1:16443: connect: connection refused

unit-sysbench-0: 08:31:16 ERROR juju.worker.uniter.operation hook "postgresql-relation-changed" (via hook dispatching script: dispatch) failed: exit status 1
unit-sysbench-0: 08:31:16 INFO juju.worker.uniter awaiting error resolution for "relation-changed" hook
```

## Versions
Operating system: Ubuntu 23.10
Juju CLI: 3.4.2-genericlinux-arm64
Juju agent: see above
Charm revision: see above
LXD: 5.21.1-2d13beb rev28463
MicroK8s: MicroK8s v1.30.0 revision 6788 (strict)

Juju status:
```
ubuntu@juju340:~$ juju status
Model Controller Cloud/Region Version SLA Timestamp
test61 lxd localhost/localhost 3.4.2 unsupported 08:32:25+02:00

SAAS Status Store URL
postgresql-k8s active mk8s admin/test59.postgresql-k8s

App Version Status Scale Charm Channel Rev Exposed Message
sysbench error 1 sysbench latest/stable 26 no hook failed: "postgresql-relation-changed"

Unit Workload Agent Machine Public address Ports Message
sysbench/0* error idle 0 10.184.219.31 hook failed: "postgresql-relation-changed"

Machine State Address Inst id Base AZ Message
0 started 10.184.219.31 juju-9e6ab4-0 ubuntu@22.04 Running
ubuntu@juju340:~$ juju status -m mk8s:test59
Model Controller Cloud/Region Version SLA Timestamp
test59 mk8s microk8s/localhost 3.4.2 unsupported 08:32:38+02:00

App Version Status Scale Charm Channel Rev Address Exposed Message
postgresql-k8s 14.11 active 1 postgresql-k8s 14/edge 247 10.152.183.162 no

Unit Workload Agent Address Ports Message
postgresql-k8s/0* active idle 10.1.204.230 Primary

Offer Application Charm Rev Connected Endpoint Interface Role
postgresql-k8s postgresql-k8s postgresql-k8s 247 1/1 database postgresql_client provider
ubuntu@juju340:~$
```

Reproduce the cross-controller setup described in the issue, then trace the postgresql-relation-changed path from src/charm.py into the data-platform interfaces and secret-get failures shown in the stack trace. Compare the behavior with the workaround in issue 37; done means the cross-controller relation completes without the remote secret or Kubernetes client errors.

Written by the indexing model from the issue text.