txn: tidb_constraint_check_in_place_pessimistic should not be global scoped (#38767)

[ti-chi-bot]

This is an automated cherry-pick of #38767

What problem does this PR solve?

Issue Number: close #38766

Problem Summary:

Changing this variable can lead to unexpected results. Internals sessions shouldn't be affected by it as well, e.g. the imeplementation of get_lock() depends on tidb_contraint_check_in_place_pessimistic=1 to work.
We should only allow sessions that are aware of its effects to use it.

What is changed and how it works?

• Change the scope of tidb_constraint_check_in_place_pessimistic to session only.
• Add a config item pessimistic-txn.constraint-check-in-place-pessimistic to control the default value of the session variable.
• Don't let it take effect in restricted SQLs.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Manually tested the config can affect the default value of the variable.

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.

Variable `tidb_constraint_check_in_place_pessimistic` is made session scope only.
Add a new config item `pessimistic-txn.constraint_check_in_place_pessimistic` to control the default value of the variable.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• cfzjywxk
• sticnarf

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[sticnarf]

LGTM

[cfzjywxk]

/merge

[ti-chi-bot]

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

Commit hash: 4885377

[ekexium]

/run-check_dev_2

[ekexium]

/run-check_dev_2

[ekexium]

/run-check_dev_2

[purelind]

/run-check_dev_2