fix: Fix checkGeneralCapacity slowly

[bigsheeper]

Cache the general count to speed up checkGeneralCapacity.

issue: #37630

[mergify]

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

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.94%. Comparing base (1084349) to head (141c3a8).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/rootcoord/meta_table.go	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37976      +/-   ##
==========================================
+ Coverage   81.07%   82.94%   +1.86%     
==========================================
  Files        1369     1080     -289     
  Lines      190968   165486   -25482     
==========================================
- Hits       154819   137255   -17564     
+ Misses      30659    22734    -7925     
- Partials     5490     5497       +7     

Components	Coverage Δ
Client	73.67% <ø> (ø)
Core	∅ <ø> (∅)
Go	83.19% <94.73%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
internal/rootcoord/constrant.go	100.00% <100.00%> (ø)
internal/rootcoord/create_collection_task.go	90.31% <100.00%> (ø)
internal/rootcoord/create_partition_task.go	91.39% <100.00%> (ø)
internal/rootcoord/meta_table.go	82.82% <92.30%> (+0.10%)	⬆️

... and 308 files with indirect coverage changes

[bigsheeper]

/run-cpu-e2e

[mergify]

@bigsheeper go-sdk check failed, comment rerun go-sdk can trigger the job again.

[mergify]

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

[mergify]

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

[bigsheeper]

/run-cpu-e2e

[mergify]

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

[mergify]

@bigsheeper go-sdk check failed, comment rerun go-sdk can trigger the job again.

[czs007]

rerun go-sdk

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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