Stop the running log backup when deleting CR (#5754)

[ti-chi-bot]

This is an automated cherry-pick of #5754

What problem does this PR solve?

In the previous operator version, delete backup CR will do no clean up on running log backup.
Users may mis-operator and find it hard to running task.

What is changed and how does it work?

1. Add enum for cleanPolicy, make input standardized.
   Now, only Retain;OnFailure;Delete are accepted as cleanPolicy input, and default is Retain.
   (This is actually no change to user behavior.)

2. Add finalizer and clean logic check for on-going log backup
   All log backup will have finalizer now. Operator will check if the log backup "on track". If so, a new task to stop log backup will run.
   The "on track" state is BackupScheduled || BackupPrepare || BackupRunning || BackupPaused || BackupStop. We lack the ability to check whether the log backup should be stopped if it failed. If the task is on fail states, we do not provide auto cleaning.

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• 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.

1. Add enum for cleanPolicy, make input standardized.
   Now, only Retain;OnFailure;Delete are accepted as cleanPolicy input, and Retain is default.
   This is actually no change to user behavior.
2. Add finalizer and clean logic check for on-going log backup
    All log backup will have finalizer now. Operator will check if the log backup "on track". If so, a new task to stop log backup will run.
    The "on track" state is `BackupScheduled || BackupPrepare || BackupRunning || BackupPaused`. 
    We lack the ability to check whether the log backup should be stopped if it failed. If the task is on states, we do not provide auto cleaning.

[csuzhangxc]

/run-pull-e2e-kind-br

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.07692% with 96 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-1.6@2427a92). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             release-1.6    #5765   +/-   ##
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  Coverage               ?   20.73%           
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  Files                  ?      219           
  Lines                  ?    30965           
  Branches               ?        0           
==============================================
  Hits                   ?     6420           
  Misses                 ?    23629           
  Partials               ?      916           

Flag	Coverage Δ
e2e	20.73% <63.07%> (?)

[ti-chi-bot]

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[csuzhangxc]

/run-pull-e2e-kind-br

[csuzhangxc]

/run-pull-e2e-kind-br