ddl: Remove partitioning

[mjonss]

What problem does this PR solve?

Issue Number: close #42616

Problem Summary:
Remove partitioning works by first reorganize all partitions to a single partition, then make that partition to the non-partitioned table.
Currently working for RANGE [COLUMNS], HASH and KEY partitioning. LIST [COLUMNS] is depending on #41537 to be merged.

Note
This will probably also needs support from TiFlash and TiCDC.

What is changed and how it works?

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.

Added support for REMOVE PARTITIONING, to make a partitioned table non-partitioned.

[ti-chi-bot]

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[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[mjonss]

/test all

[ti-chi-bot]

@mjonss: PR needs rebase.

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[mjonss]

Will need #41537 for supporting LIST partitioning (so one can REORGANIZE PARTITION to/from a single partition) and #42476 for supporting HASH/KEY partitioning.

[mjonss]

/test all

[mjonss]

/test all

[mjonss]

/retest

[mjonss]

/retest

[mjonss]

/test all

[mjonss]

/retest

[ti-chi-bot]

@mjonss: The following tests 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	f29cecd	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	f29cecd	link	true	/test check-dev
idc-jenkins-ci-tidb/build	f29cecd	link	true	/test build

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

PR needs rebase.

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 kubernetes/test-infra repository.

[mjonss]

Replaced by #42907