resource_group: replace LoadResourceGroups with GetResourceGroupsMeta…

[disksing]

…Revision

What problem does this PR solve?

Issue Number: Close #9272

What is changed and how does it work?

• change the method to GetResourceGroupsMetaRevision which only returns meta revision.
• add CountOnly option to allow only return kv count

Check List

Tests

• Unit test

Related changes merge after https://github.com/pingcap/kvproto/pull/1309

Release note

None.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 65.38462% with 9 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 76.09%. Comparing base (873ea1e) to head (11924d5). :warning: Report is 279 commits behind head on master.

:x: Your patch check has failed because the patch coverage (65.38%) is below the target coverage (74.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9273      +/-   ##
==========================================
+ Coverage   76.05%   76.09%   +0.03%     
==========================================
  Files         470      472       +2     
  Lines       73051    73061      +10     
==========================================
+ Hits        55562    55597      +35     
+ Misses      14045    14027      -18     
+ Partials     3444     3437       -7     

Flag	Coverage Δ
unittests	76.09% <65.38%> (+0.03%)	:arrow_up:

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nolouch

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-04-28 07:11:22.073969861 +0000 UTC m=+858025.885760242: :ballot_box_with_check: agreed by nolouch.

[ti-chi-bot[bot]]

@disksing: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-unit-test-next-gen-1	11924d5133c2404c39eb8035d657212a9b5a4367	link	true	/test pull-unit-test-next-gen-1
pull-unit-test-next-gen-2	11924d5133c2404c39eb8035d657212a9b5a4367	link	true	/test pull-unit-test-next-gen-2
pull-unit-test-next-gen-3	11924d5133c2404c39eb8035d657212a9b5a4367	link	true	/test pull-unit-test-next-gen-3

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