[TECH DEBT] Audit client.cmd calls to see if we're appropriately handling error conditions

See https://github.com/saltstack/salt/pull/61567 for an example of what happens when we aren't.

$ ag -Q 'client.cmd(' salt
salt/netapi/__init__.py:170:            return client.cmd(*args, **kwargs)
salt/utils/master.py:242:            return client.cmd(
salt/runners/salt.py:153:            return client.cmd(
salt/runners/jobs.py:56:            active_ = client.cmd("*", "saltutil.running", timeout=__opts__["timeout"])
salt/runners/survey.py:160:            minions = client.cmd(
salt/runners/lxc.py:246:            if client.cmd(host, "test.ping", timeout=20).get(host, None):
salt/runners/lxc.py:285:                            if client.cmd(name, "test.ping", timeout=20).get(
salt/runners/lxc.py:310:                kw = client.cmd(
salt/runners/lxc.py:390:                ping = client.cmd(mid_, "test.ping", timeout=20)
salt/runners/virt.py:536:            client.cmd(target, "virt.seed_non_shared_migrate", [disks, True])
salt/runners/manage.py:127:        client.cmd("*", "saltutil.regen_keys")
salt/runners/manage.py:526:    ret = ssh_client.cmd(target, "key.finger", tgt_type=tgt_type)
salt/runners/manage.py:581:        minions = client.cmd("*", "test.version", full_return=True, timeout=__opts__["timeout"])
salt/runners/ssh.py:25:    return client.cmd(tgt, fun, arg, timeout, tgt_type, kwarg)
salt/cloud/__init__.py:1250:                        ret = client.cmd(
salt/cloud/__init__.py:1275:                action_out = client.cmd(
salt/cloud/__init__.py:2242:                            client.cmd(
salt/cloud/libcloudfuncs.py:288:            minions = client.cmd(name, "mine.flush")
salt/modules/saltutil.py:1762:    return rclient.cmd(
salt/modules/saltutil.py:1836:        ret = wheel_client.cmd(

This is a list of all the places that we're calling client.cmd within Salt. If we're not passing full_return=True then we're just getting whatever shows up on the command line with no return code, so we don't know if Salt is reporting an error or not. It would be a great idea for us to check these places and ensure that that's desirable behavior or not.

Start with the listed client.cmd call sites, especially salt/netapi/init.py, salt/utils/master.py, salt/runners/, salt/cloud/, and salt/modules/saltutil.py. Compare each call with the behavior shown in pull request 61567 and determine whether full_return=True or another error check is appropriate. Done means every listed call has a deliberate, reviewed error-handling decision.