ddl: replace local ingest impl with backfill operators

[tangenta]

What problem does this PR solve?

Issue Number: close #53909, close #53910

Problem Summary: See #53909 (comment)

What changed and how does it work?

Before fixing the context usage, I prefer to unify local ingest and distributed ingest implementation, remove the old ingestBackfillScheduler.

Check List

Tests

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

  • I checked and no code files have been changed.

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

[tiprow]

Hi @tangenta. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 78.07692% with 57 lines in your changes missing coverage. Please review.

Project coverage is 56.0493%. Comparing base (7211d3d) to head (462896f).
Report is 8 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54149         +/-   ##
=================================================
- Coverage   72.8341%   56.0493%   -16.7849%     
=================================================
  Files          1519       1645        +126     
  Lines        435334     609579     +174245     
=================================================
+ Hits         317072     341665      +24593     
- Misses        98694     244643     +145949     
- Partials      19568      23271       +3703     

Flag	Coverage Δ
integration	36.8991% <77.6923%> (?)
unit	71.7867% <67.6923%> (-0.0577%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	52.3757% <ø> (+6.2407%)	⬆️

[lance6716]

rest lgtm

[lance6716]

Need to resolve this

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-26 04:35:37.761242103 +0000 UTC m=+780664.246730934: ☑️ agreed by D3Hunter.
• 2024-06-26 05:57:17.103119813 +0000 UTC m=+785563.588608640: ☑️ agreed by lance6716.

[tangenta]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, lance6716, tangenta

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• OWNERS [D3Hunter,lance6716,tangenta]
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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #54225.

[ti-chi-bot]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against pingcap/tidb#release-8.1 from head ti-chi-bot:cherry-pick-54149-to-release-8.1: the GitHub API request returns a 403 error: {"message":"You have exceeded a secondary rate limit and have been temporarily blocked from content creation. Please retry your request again later. If you reach out to GitHub Support for help, please include the request ID 8AAC:12E1BA:5C7620:AFE9E6:66A3541F and timestamp 2024-07-26 07:45:36 UTC.","documentation_url":"https://docs.github.com/rest/overview/rate-limits-for-the-rest-api#about-secondary-rate-limits","status":"403"}

[MimeLyc]

/cherry-pick release-8.1

[ti-chi-bot]

@MimeLyc: new pull request created to branch release-8.1: #55179.

In response to this:

/cherry-pick release-8.1

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