fix(tikv): cannot retry if pod is ready but not available

[liubog2008]

• cannot requeue if tikv is not ready but available

Fix #6419

[github-actions]

/run-pull-e2e-kind-v2

[ti-chi-bot]

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[liubog2008]

Fix #6419

[github-actions]

/run-pull-e2e-kind-v2

[liubog2008]

/cherry-pick release-2.0

[ti-chi-bot]

@liubog2008: once the present PR merges, I will cherry-pick it on top of release-2.0 in the new PR and assign it to you.

In response to this:

/cherry-pick release-2.0

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 58.33333% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.52%. Comparing base (51428d5) to head (24b4f48).

Additional details and impacted files

@@              Coverage Diff               @@
##           feature/v2    #6427      +/-   ##
==============================================
+ Coverage       43.50%   43.52%   +0.01%     
==============================================
  Files             336      336              
  Lines           22857    22879      +22     
==============================================
+ Hits             9945     9957      +12     
- Misses          12912    12922      +10     

Flag	Coverage Δ
unittest	43.52% <58.33%> (+0.01%)	⬆️

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