meta: add lock at autoid.(*allocator).Base() (#40588)

[ti-chi-bot]

This is an automated cherry-pick of #40588

What problem does this PR solve?

Issue Number: close #40584

Problem Summary:

What is changed and how it works?

autoid allocator is locked during Alloc(), but not locked during Base().

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• 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.

None

[ti-chi-bot]

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[ti-chi-bot]

@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.

To merge this cherry pick, it must first be approved by the collaborators.

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[ti-chi-bot]

@ti-chi-bot: 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
idc-jenkins-ci-tidb/unit-test	b92b979	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	b92b979	link	true	/test check-dev

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