store/tikv: ignore all other locks except the first one met by autocommit point select

[sticnarf]

What is changed and how it works?

This PR reverts #22789. In addition, this PR makes point select with max ts ignore all locks except the first one.

The solution is to minimize changes done to the release-5.0 branch.
For the master branch, I think we can use a new protocol that brings the first lock's start_ts to reduce invalid retries.

Check List

Tests

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

Benchmark result:

Release note

• Fix performance regression of point select.

[cfzjywxk]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• MyonKeminta
• cfzjywxk

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[sticnarf]

/merge

[ti-chi-bot]

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

Commit hash: 2881d0d

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