Ensure we can set migration phase to DONE idempotently. #16858
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After a model has been migrated away, after reaping the model, the migration master sets the migration phase to DONE.
Although this should not have any consequence, as the phase is already set to DONE, we need to be idempotent here. If we are setting to DONE and the model doesn't exists and we are already DONE, we should continue without error.
QA steps
Unit tests should still pass.
Documentation changes
N/A
Links
alt-model-migration-controller-debug.log: machine-0: 11:24:57 ERROR juju.worker.dependency "migration-master" manifold worker returned unexpected error: failed to set phase: could not get migration: model "3a971d6b-338d-47aa-8cbd-f5fc83be4b2a" not found (not found)