`mimir` blocks BB upgrade in all-packges pipeline

Issue

When an all-packages pipeline runs in BB umbrella, mimir does not upgrade cleanly.

Example MR with failing upgrade pipeline: big-bang/bigbang!5723 (closed)

Relevant logs:

timed out waiting for the condition on jobs/mimir-mimir-smoke-test

Acceptance Criteria

• No mimir components block the BB upgrade in all-packages pipelines