fix: rootCoord decide the builtin role cannot be deleted

[PowderLi]

issue: #29243
pr: #28961
only rootCoord read the configuration item builtinRoles, so proxy never know whether the role to be deleted is builtin.

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[codecov]

Codecov Report

Merging #29248 (ddf4c99) into 2.3 (4ab02da) will decrease coverage by 0.02%.
Report is 1 commits behind head on 2.3.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.3   #29248      +/-   ##
==========================================
- Coverage   82.09%   82.08%   -0.02%     
==========================================
  Files         832      832              
  Lines      119343   119344       +1     
==========================================
- Hits        97971    97959      -12     
- Misses      18149    18158       +9     
- Partials     3223     3227       +4     

Files	Coverage Δ
internal/proxy/impl.go	85.69% <100.00%> (ø)
internal/proxy/privilege_interceptor.go	76.72% <100.00%> (ø)
internal/proxy/util.go	91.34% <ø> (-0.07%)	⬇️
internal/rootcoord/root_coord.go	90.23% <100.00%> (+0.01%)	⬆️
pkg/util/constant.go	82.85% <100.00%> (+3.54%)	⬆️

... and 11 files with indirect coverage changes

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[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, PowderLi

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• internal/proxy/OWNERS [czs007]
• internal/rootcoord/OWNERS [czs007]
• pkg/util/OWNERS [czs007]

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