fix: revoke partitions if lost

[grobinson-grafana]

What this PR does / why we need it:

This commit fixes a bug where pods would keep hold of partitions that they had lost instead of revoking them. This would happen, for example, if the clients session failed with the broker.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
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