Add E2E tests for Medea metrics

[logist322]

Synopsis

This PR adds E2E tests for Medea metrics.

Checklist

• Created PR:
  • [x] In draft mode
  • [x] Name contains Draft: prefix
  • [x] Name contains issue reference
  • [x] Has k:: labels applied
  • [x] Has assignee
• [x] Documentation is updated (if required)
• [x] Tests are updated (if required)
• [x] Changes conform code style
• [x] CHANGELOG entry is added (if required)
• [x] FCM (final commit message) is posted
  • [ ] and approved
• [ ] Review is completed and changes are approved
• Before merge:
  • [ ] Milestone is set
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  • [ ] Draft: prefix is removed
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[logist322]

FCM

Add E2E tests for Medea metrics (#159)

[evdokimovs]

E2E tests will be implemented in another project, because of integration issues.

cc @logist322