minimize the rbac permissions for karmada-agent

[B1F030]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:
Part of #5182

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[B1F030]

/cc @zhzhuang-zju

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.20%. Comparing base (8cc712f) to head (ea06614).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5629   +/-   ##
=======================================
  Coverage   35.19%   35.20%           
=======================================
  Files         645      645           
  Lines       44869    44869           
=======================================
+ Hits        15791    15794    +3     
+ Misses      27846    27845    -1     
+ Partials     1232     1230    -2     

Flag	Coverage Δ
unittests	35.20% <ø> (+<0.01%)	⬆️

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[B1F030]

/hold