*: Adding tidb_enable_plan_cache_with_dynamic_prune_mode

[mjonss]

What problem does this PR solve?

Issue Number: ref #33031

Problem Summary:
Enable plan cache when tidb_partition_prune_mode = dynamic

What is changed and how it works?

Adding a new system variable (both global and session) tidb_enable_plan_cache_with_dynamic_prune_mode = <on|off>
to allow testing even when #33031 is not fixed.

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Defined2014
• bb7133

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[bb7133]

LGTM

[ti-chi-bot]

@mjonss: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	851c964	link	true	/test unit-test

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[ti-chi-bot]

@mjonss: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	851c964	link	true	/test unit-test

Full PR test history. Your PR dashboard.

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[bb7133]

/merge

[ti-chi-bot]

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

Commit hash: 177635f

[Defined2014]

It's only a patch version, so approved.Seems like there are some issues in UT, maybe need take a look. @mjonss