fix(pd): fix the pd name of tc with across k8s opt (#4721)

[ti-srebot]

cherry-pick #4721 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/4728

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

git push [email protected]:ti-srebot/tidb-operator.git pr/4728:release-1.3-fe6bef812f8a

---

What problem does this PR solve?

Now if spec.acrossK8s is set but spec.clusterDomain is empty in TC, the upgrading process of PD will be blocked because the name of pd in status is mismatched with the return result of function PdName.

For now, if spec.clusterDomain is empty, the PdName will return pod name whether spec.acrossK8s is true or false. However, if spec.acrossK8s is true, the real pd name generated by start-script is the full domain name.

After this PR merged, PdName will also return full domain name when spec.acrossK8s is true

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• KanShiori

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[ti-srebot]

@liubog2008 you're already a collaborator in bot's repo.

[KanShiori]

/merge

[ti-chi-bot]

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

Commit hash: ec96593

[codecov-commenter]

Codecov Report

Merging #4728 (173000b) into release-1.3 (2236cd5) will increase coverage by 9.99%.
The diff coverage is 100.00%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.3    #4728      +/-   ##
===============================================
+ Coverage        62.36%   72.36%   +9.99%     
===============================================
  Files              186      190       +4     
  Lines            20867    23340    +2473     
===============================================
+ Hits             13014    16890    +3876     
+ Misses            6638     5246    -1392     
+ Partials          1215     1204      -11     

Flag	Coverage Δ
e2e	59.97% <100.00%> (?)
unittest	62.37% <66.66%> (+<0.01%)	⬆️

[liubog2008]

/test pull-e2e-kind

[liubog2008]

/test pull-e2e-kind-across-kubernetes

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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[KanShiori]

/test pull-e2e-kind-across-kubernetes pull-e2e-kind