txn: avoid the gc resolving pessimistic locks of ongoing transactions (#24601)

[ti-srebot]

cherry-pick #24601 to release-5.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/24652

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/24652:release-5.0-e628bad698b5

---

What problem does this PR solve?

Issue Number: close #24591

Problem Summary:
The pessimistic locks of ongoing transaction may be resolved by the gc worker and the user will not be aware of this during execution.

What is changed and how it works?

What's Changed:
Decrement the minStartTS by one setting the safepoint so that the locks of ongoing transaction would not be collected by this gc round.

How it Works:

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

Release note

• Fix the issue that ongoing transaction could be aborted by the gc worker.

[ti-srebot]

/run-all-tests

[ti-srebot]

@cfzjywxk please accept the invitation then you can push to the cherry-pick pull requests.
https://github.com/ti-srebot/tidb/invitations

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• MyonKeminta
• youjiali1995

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by writing /lgtm in a comment.
Reviewer can cancel approval by writing /lgtm cancel in a comment.

[zhouqiang-cl]

/merge

[ti-chi-bot]

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

Commit hash: 5465c62

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.