dxf/ddl: always enable DXF and fast reorg in nextgen (#64179)

[ti-chi-bot]

This is an automated cherry-pick of #64179

What problem does this PR solve?

Issue Number: ref #61702

Problem Summary:

What changed and how does it work?

since the default value of those 2 variable is true now, we achieve this by disallowing setting those variables

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

[ti-chi-bot]

@D3Hunter This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

@ti-chi-bot: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

Details

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[D3Hunter]

/unhold

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, D3Hunter

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Details

Needs approval from an approver in each of these files:

• OWNERS [Benjamin2037,D3Hunter]
• pkg/ddl/OWNERS [Benjamin2037,D3Hunter]
• pkg/disttask/OWNERS [Benjamin2037,D3Hunter]
• pkg/executor/importer/OWNERS [Benjamin2037,D3Hunter]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-10-31 05:36:58.867061023 +0000 UTC m=+1627724.944313573: ☑️ agreed by D3Hunter.
• 2025-10-31 05:47:17.878891724 +0000 UTC m=+1628343.956144284: ☑️ agreed by Benjamin2037.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release-nextgen-20251011@c634954). Learn more about missing BASE report.

Additional details and impacted files

@@                      Coverage Diff                      @@
##             release-nextgen-20251011     #64208   +/-   ##
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  Coverage                            ?   72.3071%           
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  Files                               ?       1855           
  Lines                               ?     501419           
  Branches                            ?          0           
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  Hits                                ?     362562           
  Misses                              ?     116700           
  Partials                            ?      22157           

Flag	Coverage Δ
unit	71.8123% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.8700% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	46.4311% <0.0000%> (?)

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