feat: create events for cleanup policies

[realshuting]

Signed-off-by: ShutingZhao shuting@nirmata.com

Explanation

With this change, an event is created for the successfully applied cleanup policy,

Related issue

Closes #5976.

Milestone of this PR

/1.9.0

What type of PR is this

/enhancement

Proposed Changes

Proof Manifests

See events are created for both cluatercleanuppolicy and cleanuppolicy:

✗ k describe cleanpol cleanup-pod
...
Events:
  Type    Reason         Age   From                Message
  ----    ------         ----  ----                -------
  Normal  PolicyApplied  45s   cleanup-controller  successfully cleaned up the target resource Pod/default/example


✗ k describe ccleanpol cleanup-pod  
...
Events:
  Type    Reason         Age   From                Message
  ----    ------         ----  ----                -------
  Normal  PolicyApplied  53s   cleanup-controller  successfully cleaned up the target resource Pod/default/example

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.
  • I have added or changed the documentation myself in an existing PR and the link is:
  • I have raised an issue in kyverno/website to track the documentation update and the link is:

Further Comments

[realshuting]

/cherry-pick release-1.9

[codecov]

Codecov Report

Merging #5982 (6d8224b) into main (1997a29) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #5982      +/-   ##
==========================================
- Coverage   35.89%   35.86%   -0.04%     
==========================================
  Files         192      193       +1     
  Lines       21060    21078      +18     
==========================================
  Hits         7560     7560              
- Misses      12666    12684      +18     
  Partials      834      834              

Impacted Files	Coverage Δ
cmd/cleanup-controller/handlers/cleanup/event.go	0.00% <0.00%> (ø)
...md/cleanup-controller/handlers/cleanup/handlers.go	0.00% <0.00%> (ø)

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