bump TiDB Operator to 1.6.1 and TiDB to 8.5.0

[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]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[csuzhangxc]

/run-all-tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.32%. Comparing base (a16b2e8) to head (f455598).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5988      +/-   ##
==========================================
+ Coverage   57.19%   63.32%   +6.12%     
==========================================
  Files         259      263       +4     
  Lines       33233    45664   +12431     
==========================================
+ Hits        19008    28915    +9907     
- Misses      12291    14776    +2485     
- Partials     1934     1973      +39     

Flag	Coverage Δ
e2e	46.71% <ø> (?)
unittest	56.98% <ø> (-0.22%)	⬇️

[csuzhangxc]

/run-pull-e2e-kind

[csuzhangxc]

/run-pull-e2e-kind-br

[csuzhangxc]

/run-pull-e2e-kind-serial

[csuzhangxc]

/cherry-pick release-1.6

[ti-chi-bot]

@csuzhangxc: new pull request created to branch release-1.6: #5990.

In response to this:

/cherry-pick release-1.6

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