[Feature] Add cleanup jobs to remove stale updaterequests

[realshuting]

Problem Statement

We are seeing an issue that URs get piled up in the cluster for different reasons. While we are working on fixing root causes, it would be good to have a circuit breaker to stop UR generation, or to add cleanup jobs to remove pending URs based on the creation timestamp.

Related issues reported in Slack:

https://kubernetes.slack.com/archives/CLGR9BJU9/p1714125598241909?thread_ts=1713878700.640029&cid=CLGR9BJU9
https://kubernetes.slack.com/archives/CLGR9BJU9/p1715260460611989

Solution Description

If we want to add cleanup jobs, there are existing ones to clean up (cluster)admissionreports:

https://github.com/kyverno/kyverno/blob/main/charts/kyverno/templates/cleanup/cleanup-admission-reports.yaml

Alternatives

No response

Additional Context

No response

Slack discussion

No response

Research

• I have read and followed the documentation AND the troubleshooting guide.
• I have searched other issues in this repository and mine is not recorded.