autoid_service: fix potential 'duplicated entry' error when tidb exit for AUTO_ID_CACHE=1 tables (#46445)

[ti-chi-bot]

This is an automated cherry-pick of #46445

What problem does this PR solve?

Issue Number: close #46444

Problem Summary:

What is changed and how it works?

If the autoid service node is not leader, it should not save the cached id back to tikv.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • See the steps in the comments of #46444
• No code

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.

Fix potential 'duplicated entry' error when tidb exit for AUTO_ID_CACHE=1 tables.
The bug could happen when a tidb is the autoid_service leader previously, and exit as non-leader, it stores staled next autoid value to tikv in a force rebase way. If the value is loaded again, the autoid decreases and could cause duplicates.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@d7ce2f2). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: djshow832, YangKeao

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Needs approval from an approver in each of these files:

• OWNERS [YangKeao,djshow832]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-30 08:34:30.168593065 +0000 UTC m=+1916034.717609052: ☑️ agreed by YangKeao.
• 2023-11-27 01:51:14.130288924 +0000 UTC m=+801102.795515119: ☑️ agreed by djshow832.