fix: [2.4] fix grant/revoke v2 meta and unclear error messages

[shaoting-huang]

cherry-pick from #38110, #38130
related issue: #37031

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 6 lines in your changes missing coverage. Please review.

Project coverage is 80.58%. Comparing base (b29237e) to head (64c4b91).
Report is 3 commits behind head on 2.4.

Files with missing lines	Patch %	Lines
internal/rootcoord/root_coord.go	87.87%	3 Missing and 1 partial ⚠️
internal/proxy/util.go	93.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #38146      +/-   ##
==========================================
+ Coverage   72.27%   80.58%   +8.31%     
==========================================
  Files        1073     1073              
  Lines      167708   167763      +55     
==========================================
+ Hits       121203   135193   +13990     
+ Misses      42078    28137   -13941     
- Partials     4427     4433       +6     

Files with missing lines	Coverage Δ
internal/proxy/impl.go	85.00% <100.00%> (+0.21%)	⬆️
internal/rootcoord/meta_table.go	83.72% <100.00%> (+0.02%)	⬆️
pkg/util/constant.go	98.36% <100.00%> (+8.19%)	⬆️
pkg/util/merr/errors.go	92.18% <ø> (ø)
pkg/util/merr/utils.go	83.65% <100.00%> (+0.12%)	⬆️
internal/proxy/util.go	90.82% <93.33%> (+<0.01%)	⬆️
internal/rootcoord/root_coord.go	89.30% <87.87%> (-0.04%)	⬇️

... and 233 files with indirect coverage changes

[mergify]

@shaoting-huang E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, shaoting-huang

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Needs approval from an approver in each of these files:

• configs/OWNERS [czs007]
• internal/proxy/OWNERS [czs007]
• internal/rootcoord/OWNERS [czs007]
• pkg/util/OWNERS [czs007]
• tests/integration/OWNERS [czs007]

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