Release v0.51.1

[ffjlabo]

What this PR does:

as title

Why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[github-actions]

The following 1 GitHub releases will be created once this pull request got merged.

Release v0.51.1 with changes since v0.51.0

Internal Changes

• Release v0.51.1
• Fix rolling back deployments are ignored on piped restarted event (#5717)
• add: temporary volume option (#5716)
• [bot] Update contributors (#5715)
• Create SECURITY.md (#5710)
• Port logic from k8s plugin (#5709)
• Update MAINTAINER.md file (#5711)
• Implemented ListStageCommands() on piped side (#5685)
• Fix error on values pass to action-event-register (#5708)
• Enable deployment trace for pipecd workflow (#5707)
• Add docs for deployment trace feature (#5706)
• Update docs index weight (#5705)
• Remove Name and Version methods from plugins (#5704)
• [Plugin SDK] Remove old interfaces and refactor the SDK (#5703)
• Use new plugin SDK interface to build kubernetes_multicluster plugin (#5702)
• Use new plugin sdk interface to build wait plugin (#5700)
• Use new plugin sdk interface to build example plugin (#5699)
• Use new plugin sdk interface to build kubernetes plugin (#5701)
• [Plugin SDK] Implement another way to create plugin (#5698)
• [bot] Publish quickstart manifests (#5697)
• Revert "Temporary disable v1 add application form on UI (#5694)" (#5696)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.94%. Comparing base (8d4a63c) to head (5214594).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5718      +/-   ##
==========================================
+ Coverage   26.93%   26.94%   +0.01%     
==========================================
  Files         501      501              
  Lines       53027    53027              
==========================================
+ Hits        14284    14290       +6     
+ Misses      37676    37670       -6     
  Partials     1067     1067              

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