fix: remove cleanup cronjobs

[MariamFahmy98]

Explanation

This PR removes the cleanup cronjobs that are responsible of deleting the admission reports which are no longer exist.

Related issue

N/A

Milestone of this PR

/milestone 1.13.0

Documentation (required for features)

My PR contains new or altered behavior to Kyverno.

• [ ] I have sent the draft PR to add or update the documentation and the link is:

What type of PR is this

Proposed Changes

Proof Manifests

Checklist

• [ ] I have read the contributing guidelines.
• [ ] I have read the PR documentation guide and followed the process including adding proof manifests to this PR.
• [ ] This is a bug fix and I have added unit tests that prove my fix is effective.
• [ ] This is a feature and I have added CLI tests that are applicable.
• [ ] My PR needs to be cherry picked to a specific release branch which is .
• [ ] My PR contains new or altered behavior to Kyverno and
  • [ ] CLI support should be added and my PR doesn't contain that functionality.

Further Comments