Opt: Add a ValidatingAdmissionPolicy for volume storage

[fgksgf]

What problem does this PR solve?

#6172

What is changed and how does it work?

Add a ValidatingAdmissionPolicy, which ensures:

• Storage values must be greater than 0
• Storage values can only increase, never decrease (for UPDATE operations)

Code changes

• [x] Has Go code change
• [ ] Has CI related scripts change

Tests

• [ ] Unit test
• [x] E2E test
• [ ] Manual test
• [ ] No code

Side effects

• [ ] Breaking backward compatibility
• [ ] Other side effects:

Related changes

• [ ] Need to cherry-pick to the release branch
• [ ] Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[github-actions[bot]]

/run-pull-e2e-kind-v2

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 46.12%. Comparing base (91702a8) to head (64fba7b).

Additional details and impacted files

@@             Coverage Diff             @@
##           feature/v2    #6266   +/-   ##
===========================================
  Coverage       46.12%   46.12%           
===========================================
  Files             304      304           
  Lines           20008    20008           
===========================================
  Hits             9229     9229           
  Misses          10779    10779           

Flag	Coverage Δ
unittest	46.12% <ø> (ø)

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[github-actions[bot]]

/run-pull-e2e-kind-v2

[github-actions[bot]]

/run-pull-e2e-kind-v2

[github-actions[bot]]

/run-pull-e2e-kind-v2

[github-actions[bot]]

/run-pull-e2e-kind-v2

[liubog2008]

/lgtm

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-06-27 06:31:16.647966817 +0000 UTC m=+1030929.371145792: :ballot_box_with_check: agreed by liubog2008.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liubog2008

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