ebs snapshot backup: remove checking store number (#51886)

[ti-chi-bot]

This is an automated cherry-pick of #51886

warn if store num not match

What problem does this PR solve?

Issue Number: close #51957

Problem Summary:
It is unnecessary to check the store number in data restore phase -- since tidb-operator will help us to check it.
Now this check breaks a workaround for one store cannot unexpectedly bootstrap after restoring.

What changed and how does it work?

This PR removes the check to number of stores.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

  The change is tiny and I manually tested it in a local k8s cluster.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, YuJuncen

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Needs approval from an approver in each of these files:

• OWNERS [YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-20 12:36:01.732815729 +0000 UTC m=+1466588.755062116: ☑️ agreed by YuJuncen.
• 2024-03-20 12:56:31.86696149 +0000 UTC m=+1467818.889207875: ☑️ agreed by BornChanger.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-6.5@9ad6f42). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #51961   +/-   ##
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[ti-chi-bot]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against pingcap/tidb#release-7.5 from head ti-chi-bot:cherry-pick-51961-to-release-7.5: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"No commits between pingcap:release-7.5 and ti-chi-bot:cherry-pick-51961-to-release-7.5"}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request","status":"422"}

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #57083.