ebs br: add gc immune flag

[BornChanger]

What problem does this PR solve?

What is changed and how does it work?

Code changes

Provide an new flag attribute skipGC to VolumeBackup CRD at top level. By setting it manually, customer can make the volumebackup immune to GC triggered by backup scheduler.

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

Tests

• [x] Unit test
• [ ] E2E test
• [x] 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.

[BornChanger]

/cc @WangLe1321 @YuJuncen

[BornChanger]

/retest

[BornChanger]

/retest

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.22222% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 67.30%. Comparing base (f7c4a71) to head (906fd91).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5567      +/-   ##
==========================================
+ Coverage   61.43%   67.30%   +5.86%     
==========================================
  Files         235      246      +11     
  Lines       30206    34097    +3891     
==========================================
+ Hits        18558    22949    +4391     
+ Misses       9785     9227     -558     
- Partials     1863     1921      +58     

Flag	Coverage Δ
e2e	45.88% <0.00%> (?)
unittest	61.42% <22.22%> (-0.02%)	:arrow_down:

[BornChanger]

/retest

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-03-08 09:14:56.744795073 +0000 UTC m=+417723.767041461: :ballot_box_with_check: agreed by WangLe1321.
• 2024-03-08 09:18:51.393252346 +0000 UTC m=+417958.415498731: :heavy_multiplication_x::repeat: reset by ti-chi-bot[bot].

[ti-chi-bot[bot]]

New changes are detected. LGTM label has been removed.

[BornChanger]

/retest

[BornChanger]

/run-pull-e2e-kind-across-kubernetes

[BornChanger]

/run-pull-e2e-kind-br

[ti-chi-bot[bot]]

@YuJuncen: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: WangLe1321, YuJuncen

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [WangLe1321]

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[csuzhangxc]

/cherry-pick release-1.5

[ti-chi-bot]

@csuzhangxc: new pull request created to branch release-1.5: #5571.

In response to this:

/cherry-pick release-1.5

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