executor: revert #25730 to fix #28011 (#42488)

[ti-chi-bot]

This is an automated cherry-pick of #42488

What problem does this PR solve?

Issue Number: close #28011

Problem Summary: as described in #28011 , kv pairs converted from locks is visible to union-scan, which leads to duplicated rows (one from snapshot and the other from mem-index-reader).

What is changed and how it works?

Since tikv/tikv#13694 has introduced a better solution to the problem of accumulated locks, thus we can simply revert #25730 .

Here is the benchmark result. It shows that there is a slight regression in point-get workload.

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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[zyguan]

tikv/tikv#13694 is unavailable in this release.