txn: fix the incorrect untouch used in optimistic transactions(#30447)

[cfzjywxk]

What problem does this PR solve?

Issue Number: ref #30410

Problem Summary:
When the optimistic transaction is used, the untouched key optimization is not compatible with lazy existence check and results in data inconsistency. Cherry-pick #30447 to release 5.0.

What is changed and how it works?

Check List

Tests

• Unit test

Side effects

Documentation

Release note

Fix the data inconsistency caused by incorrect usage of lazy existence check and untouch key optimization.

[ti-chi-bot]

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• you06
• youjiali1995

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[XuHuaiyu]

/merge

[ti-chi-bot]

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

Commit hash: 0a63fcf

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