test: e2e test for fieldoverrider

[sophiefeifeifeiya]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Write E2E test for FieldOverrider.

Which issue(s) this PR fixes:
Fixes #5330
Proposal PR #5591
Feature PR #5449

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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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.86%. Comparing base (721107d) to head (733c994).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5598      +/-   ##
==========================================
- Coverage   34.87%   34.86%   -0.01%     
==========================================
  Files         645      645              
  Lines       44833    44833              
==========================================
- Hits        15637    15633       -4     
- Misses      27991    27993       +2     
- Partials     1205     1207       +2     

Flag	Coverage Δ
unittests	34.86% <ø> (-0.01%)	⬇️

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