fix: configmap not found error during the cluster deleting and refine code (#6792)

[sophon-zt]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 21.05263% with 60 lines in your changes are missing coverage. Please review.

Project coverage is 65.62%. Comparing base (3882d3e) to head (9fd18a0).
Report is 1 commits behind head on main.

Files	Patch %	Lines
apis/apps/v1alpha1/config_meta.go	0.00%	52 Missing ⚠️
...ers/apps/configuration/configuration_controller.go	73.68%	3 Missing and 2 partials ⚠️
controllers/apps/configuration/config_util.go	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6793      +/-   ##
==========================================
- Coverage   65.74%   65.62%   -0.13%     
==========================================
  Files         309      310       +1     
  Lines       37527    37531       +4     
==========================================
- Hits        24671    24628      -43     
- Misses      10762    10800      +38     
- Partials     2094     2103       +9     

Flag	Coverage Δ
unittests	65.62% <21.05%> (-0.13%)	⬇️

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[sophon-zt]

/approve