br: modify time complete of restore status (#5248)

[ti-chi-bot]

This is an automated cherry-pick of #5248

What problem does this PR solve?

Make sure time complete is valid for restore with volume-snapshot mode.

Closes #5239

What is changed and how does it work?

Before this change, the timeStarted and timeCompleted in restore status is the time of data restore phase. We change timeStarted to start time of volume restore phase and timeCompleted to the time of restore complete.

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.

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

Merging #5260 (f463992) into release-1.5 (c89b9af) will increase coverage by 0.01%.
The diff coverage is 0.00%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.5    #5260      +/-   ##
===============================================
+ Coverage        57.26%   57.27%   +0.01%     
===============================================
  Files              249      249              
  Lines            29900    29901       +1     
===============================================
+ Hits             17121    17125       +4     
+ Misses           11119    11117       -2     
+ Partials          1660     1659       -1     

Flag	Coverage Δ
unittest	57.27% <0.00%> (+0.01%)	⬆️