set TZ environment for webhook and advanced statefulset (#3034)

[ti-srebot]

cherry-pick #3034 to release-1.1

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What problem does this PR solve?

fixes #2944

What is changed and how does it work?

Check List

Tests

• Unit test
• E2E test
• Stability test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has Go code change
• Has CI related scripts change
• Has Terraform scripts change

Side effects

• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Does this PR introduce a user-facing change?:

Configure TZ environment for admission webhook and advanced statefulset controller deployed in tidb-operator chart

[cofyc]

/merge

[ti-srebot]

/run-all-tests

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-1.1@cd8a176). Click here to learn what that means.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release-1.1    #3041   +/-   ##
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  Coverage               ?   44.41%           
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  Files                  ?      148           
  Lines                  ?    15756           
  Branches               ?        0           
==============================================
  Hits                   ?     6998           
  Misses                 ?     8197           
  Partials               ?      561           

Flag	Coverage Δ
#unittest	44.41% <0.00%> (?)

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