*: add tidb_enable_global_index session variables

[Defined2014]

What problem does this PR solve?

Issue Number: close #48825

Problem Summary: Remove EnableGlobalIndex in config file, add a session/global variable named tidb_enable_global_index.

What changed and how does it work?

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.

Remove `EnableGlobalIndex` in config file, add a session variable named `tidb_enable_global_index`.

[tiprow]

Hi @Defined2014. Thanks for your PR.

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[codecov]

Codecov Report

Merging #48834 (d172998) into master (d4b41be) will increase coverage by 1.5258%.
Report is 4 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48834        +/-   ##
================================================
+ Coverage   70.9906%   72.5164%   +1.5258%     
================================================
  Files          1368       1391        +23     
  Lines        404180     411232      +7052     
================================================
+ Hits         286930     298211     +11281     
+ Misses        97260      94207      -3053     
+ Partials      19990      18814      -1176     

Flag	Coverage Δ
integration	43.9381% <100.0000%> (?)
unit	70.9910% <ø> (+0.0003%)	⬆️

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

Components	Coverage Δ
dumpling	53.9663% <ø> (ø)
parser	∅ <ø> (∅)
br	48.3387% <ø> (-4.6870%)	⬇️

[Defined2014]

/test check-dev2

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[Defined2014]

/test unit-test

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/test unit-test

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[Defined2014]

/cc @mjonss PTAL

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/test unit-test

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[bb7133]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-29 08:58:55.977132905 +0000 UTC m=+999564.642359101: ☑️ agreed by mjonss.
• 2023-11-29 17:50:50.356676375 +0000 UTC m=+1031479.021902571: ☑️ agreed by bb7133.

[easonn7]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, easonn7, mjonss, tangenta, zimulala

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Needs approval from an approver in each of these files:

• OWNERS [bb7133,mjonss,tangenta,zimulala]
• pkg/config/OWNERS [easonn7]
• pkg/ddl/OWNERS [tangenta,zimulala]
• pkg/sessionctx/variable/OWNERS [easonn7]

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