bump TiDB Operator to 1.5.1

[csuzhangxc]

What problem does this PR solve?

What is changed and how does it work?

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

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[ti-chi-bot]

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[codecov-commenter]

Codecov Report

Merging #5344 (76c06a8) into release-1.5 (8a6fdd9) will decrease coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.5    #5344      +/-   ##
===============================================
- Coverage        61.68%   61.68%   -0.01%     
===============================================
  Files              228      228              
  Lines            28853    28853              
===============================================
- Hits             17799    17798       -1     
  Misses            9317     9317              
- Partials          1737     1738       +1     

Flag	Coverage Δ
unittest	61.68% <ø> (-0.01%)	⬇️