fix: lost dbname when only passing collection id to describeCollection

[chyezh]

issue: #30931
pr: #31167

[codecov]

Codecov Report

Attention: Patch coverage is 86.36364% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 82.23%. Comparing base (9d712f4) to head (cfb5a65).
Report is 1 commits behind head on 2.3.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.3   #31177      +/-   ##
==========================================
- Coverage   82.24%   82.23%   -0.02%     
==========================================
  Files         844      844              
  Lines      122225   122240      +15     
==========================================
- Hits       100521   100519       -2     
- Misses      18472    18488      +16     
- Partials     3232     3233       +1     

Files	Coverage Δ
internal/metastore/kv/rootcoord/kv_catalog.go	87.88% <100.00%> (+0.12%)	⬆️
internal/rootcoord/meta_table.go	82.46% <100.00%> (ø)
internal/rootcoord/root_coord.go	90.82% <100.00%> (+0.01%)	⬆️
internal/rootcoord/describe_collection_task.go	82.35% <40.00%> (-17.65%)	⬇️

... and 13 files with indirect coverage changes

[jaime0815]

/lgtm

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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