Fix tiflash config after v5.4.0 (#4430)

[ti-srebot]

cherry-pick #4430 to release-1.3
You can switch your code base to this Pull Request by using git-extras:

# In tidb-operator repo:
git pr https://github.com/pingcap/tidb-operator/pull/4436

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tidb-operator.git pr/4436:release-1.3-1eb8baa4f2b2

---

What problem does this PR solve?

Close #4434
Close #4435

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

  • Deploy operator and v5.4.0 cluster, check the result of using TiFlash.
  • Deploy v1.3.0 operator and v5.3.0 cluster, use TiFlash, then upgrade operator and cluster to v5.4.0 cluster, check the result of using TiFlash.
  • Deploy v1.3.0 operator and v5.4.0 cluster, use TiFlash, then upgrade operator, check the result of using TiFlash.

• 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.

Fix the issue about creating TiFlash replicas for tables

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• DanielZhangQD

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[ti-srebot]

@KanShiori you're already a collaborator in bot's repo.

[DanielZhangQD]

LGTM

[DanielZhangQD]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ebeae91

[codecov-commenter]

Codecov Report

Merging #4436 (ebeae91) into release-1.3 (2cba41f) will increase coverage by 9.80%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-1.3    #4436      +/-   ##
===============================================
+ Coverage        62.37%   72.18%   +9.80%     
===============================================
  Files              184      188       +4     
  Lines            19774    22177    +2403     
===============================================
+ Hits             12335    16008    +3673     
+ Misses            6295     5037    -1258     
+ Partials          1144     1132      -12     

Flag	Coverage Δ
e2e	60.08% <0.00%> (?)
unittest	62.38% <100.00%> (+<0.01%)	⬆️

[DanielZhangQD]

/test pull-e2e-kind

[DanielZhangQD]

/test pull-e2e-kind