Comment 8 for bug 1822117

Previously linked implementation was relying on status history to revert model status once the credential becomes valid. This is unreliable and undesirable. It was closed.

New PR against 2.6 does not care for history but still achieves the same result - model looks suspended and its status gets reverted when model credential is deemed valid again: https://github.com/juju/juju/pull/10237