pd: support schema change by tls

[HuSharp]

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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[HuSharp]

/test all

[ti-chi-bot]

@HuSharp: No presubmit jobs available for pingcap/tidb-operator@master

In response to this:

/test all

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[csuzhangxc]

/run-all-tests

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 48 lines in your changes missing coverage. Please review.

Project coverage is 61.55%. Comparing base (a16b2e8) to head (a13b241).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5708      +/-   ##
==========================================
+ Coverage   57.19%   61.55%   +4.35%     
==========================================
  Files         259      262       +3     
  Lines       33233    45551   +12318     
==========================================
+ Hits        19008    28039    +9031     
- Misses      12291    15511    +3220     
- Partials     1934     2001      +67     

Flag	Coverage Δ
e2e	34.09% <18.75%> (?)
unittest	57.05% <64.58%> (-0.15%)	⬇️

[csuzhangxc]

/run-pull-e2e-kind-across-kubernetes

[csuzhangxc]

/run-all-tests

[HuSharp]

/run-all-tests

[HuSharp]

/run-all-tests

[HuSharp]

/run-pull-e2e-kind-across-kubernetes

[HuSharp]

/run-pull-e2e-kind

[HuSharp]

/run-all-tests

[HuSharp]

/run-all-tests

[HuSharp]

/run-all-tests

[csuzhangxc]

/run-all-tests

[csuzhangxc]

/run-pull-e2e-kind

[csuzhangxc]

/run-pull-e2e-kind

[csuzhangxc]

/run-pull-e2e-kind