fix: Update pruning pods to use different labels and add unit test

[Sovietaced]

Pull Request Template

Fixes #335

Also introduces protocmp as a way to make assertions on entire proto structs instead of cherry picking assertions on individual fields. This should make unit test much more robust moving forward if used.

Type of change

Please select the type of change your PR introduces:

• Bugfix
• Feature
• Code Style Update (formatting, renaming)
• Refactor (code changes that do not fix a bug or add a feature)
• Documentation Update
• Other (please describe):

How Has This Been Tested?

See new unit tests

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• Any dependent changes have been merged and published in downstream modules.

[Sovietaced]

I will follow up with a similar change for the db migrator.