enhance: the actual number of databases should equal the config value

[jaime0815]

pr: #38006

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@          Coverage Diff           @@
##             2.4   #38009   +/-   ##
======================================
  Coverage       ?   72.27%           
======================================
  Files          ?     1070           
  Lines          ?   167374           
  Branches       ?        0           
======================================
  Hits           ?   120962           
  Misses         ?    41975           
  Partials       ?     4437           

Files with missing lines	Coverage Δ
internal/rootcoord/create_db_task.go	84.21% <100.00%> (ø)

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, jaime0815

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