kubeflow-profiles rev 855 exposes velero_backup_config endpoints that the bundle builder cannot fulfill

**Note: This issue was generated with AI assistance (GitHub Copilot) based on automated log analysis and triage.**
Filed by @canonical/solutions-qa

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## Sighting

`kubeflow-profiles` rev 855 (track `2.0/edge`) exposes two new required relation endpoints — `profiles-backup-config` and `user-workloads-backup-config` — both implementing the `velero_backup_config` interface. The bundle builder is unable to find a charm providing this interface, causing `test_build_bundle` to fail with an `UnfulfilledEndpointsError` across every test plan exercising this charm.

## Error

```
bundle_builder.bundle_builder.UnfulfilledEndpointsError: Could not build a complete valid bundle:
Cannot fulfill application endpoints:
target:profiles-backup-config,
target:user-workloads-backup-config,
neighbor:catalogue-item

Unfulfilled interfaces: catalogue, velero_backup_config
```

## Observed impact

- **100% failure rate** for `kubeflow-profiles` rev 855 since at least 2026-04-04
- All test plans for this charm fail at `test_build_bundle`; every downstream test is skipped
- Affects both `catalogue-k8s` cross-model-mesh plans and all other integration test plans for this charm

## Execution metadata

| Field | Value |
|---|---|
| Charm | `kubeflow-profiles` rev 855, track `2.0/edge` |
| Unfulfilled interface | `velero_backup_config` |
| Unfulfilled endpoints | `profiles-backup-config`, `user-workloads-backup-config` |
| Artefact ID | 406244 |
| Environment | `juju:3/stable ubuntu:24.04 kubernetes` |
| Pipeline ref | `16a3b14` |

## Test Observer

https://test-observer.canonical.com/#/charms/406244?testExecutionId=471106&testResultId=10518694

Start with the test_build_bundle entry point and the test plans exercising kubeflow-profiles, then inspect how the bundle builder resolves the profiles-backup-config and user-workloads-backup-config endpoints. Confirm the required provider and catalogue-item relationships, and consider the issue complete when bundle construction succeeds and the affected integration plans no longer fail at setup.

Written by the indexing model from the issue text.