Cancel the redundancy setting for gracePeriod in cluster-controller

[XiShanYongYe-Chang]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

No matter whether it is on the if branch or the else branch, the assignment of gracePeriod is the same, so it can be assigned in advance.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[XiShanYongYe-Chang]

/cc @RainbowMango @Garrybest

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.34%. Comparing base (def5021) to head (efd272a).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6332      +/-   ##
==========================================
+ Coverage   49.32%   49.34%   +0.01%     
==========================================
  Files         677      677              
  Lines       55004    55002       -2     
==========================================
+ Hits        27133    27143      +10     
+ Misses      26105    26095      -10     
+ Partials     1766     1764       -2     

Flag	Coverage Δ
unittests	49.34% <100.00%> (+0.01%)	⬆️

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[RainbowMango]

No matter whether it is on the if branch or the else branch, the assignment of gracePeriod is the same, so it can be assigned in advance.

Do you mean the ClusterStartupGracePeriod and ClusterMonitorGracePeriod always same?