fix crb_status_controller ut is referencing namespaced objects

[zach593]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

It is clearly that crb should only handle root scope resources, so it is inappropriate for the tests in the crb status controller to reference pod.

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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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.25%. Comparing base (057cf86) to head (0e64e7e).
Report is 10 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5780      +/-   ##
==========================================
- Coverage   42.31%   42.25%   -0.06%     
==========================================
  Files         655      655              
  Lines       55756    55847      +91     
==========================================
+ Hits        23591    23599       +8     
- Misses      30651    30736      +85     
+ Partials     1514     1512       -2     

Flag	Coverage Δ
unittests	42.25% <ø> (-0.06%)	⬇️

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[RainbowMango]

/lgtm
/approve
Thanks.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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[RainbowMango]

/kind cleanup