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

[tiancaiamao]

close #46444

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What is changed and how it works?

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

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[tiancaiamao]

#46507 there is already one.