replication mode: fix wrong available store list

[disksing]

What problem does this PR solve?

Issue Number: Close #7221 #7218

What is changed and how does it work?

As now canSync and hasMajority are calculated using placement rules, we can contain stores that have only learners in avalable stores list.

This PR also fix a minor bug that relates to available stores id comparsion.

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[CabinfeverB]

rest LGTM

[codecov]

Codecov Report

Merging #7222 (ed860a2) into master (8b2896b) will decrease coverage by 0.20%.
Report is 2 commits behind head on master.
The diff coverage is 27.66%.

@@            Coverage Diff             @@
##           master    #7222      +/-   ##
==========================================
- Coverage   74.65%   74.45%   -0.20%     
==========================================
  Files         442      442              
  Lines       47744    47897     +153     
==========================================
+ Hits        35642    35661      +19     
- Misses       8957     9086     +129     
- Partials     3145     3150       +5     

Flag	Coverage Δ
unittests	74.45% <27.66%> (-0.20%)	⬇️

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[disksing]

/merge

[ti-chi-bot]

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/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ed860a2

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #7224.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #7328.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #7781.