bump TiDB Operator to v1.5.2, TiDB to v7.5.0

[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

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

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2281d37) 61.56% compared to head (3ab07b7) 67.95%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.5    #5521      +/-   ##
===============================================
+ Coverage        61.56%   67.95%   +6.39%     
===============================================
  Files              228      241      +13     
  Lines            29174    33116    +3942     
===============================================
+ Hits             17960    22503    +4543     
+ Misses            9444     8811     -633     
- Partials          1770     1802      +32     

Flag	Coverage Δ
e2e	47.96% <ø> (?)
unittest	61.56% <ø> (+<0.01%)	⬆️

[csuzhangxc]

/run-all-tests