feat: Add MDS support for index pattern validate script

[raintygao]

Description

feat: Add MDS support for index pattern validate script

Screenshot

No UI change

Testing the changes

Turn on/off the MDS, and then visit index pattern script field edit page, the API won't break down any more if editing an index pattern on remote data source.

Changelog

• feat: Add MDS support for index pattern validate script

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.70%. Comparing base (21f1f73) to head (aaaf852).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...management/server/routes/preview_scripted_field.ts	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9371      +/-   ##
==========================================
+ Coverage   61.68%   61.70%   +0.02%     
==========================================
  Files        3816     3816              
  Lines       91829    91830       +1     
  Branches    14543    14544       +1     
==========================================
+ Hits        56649    56668      +19     
+ Misses      31521    31506      -15     
+ Partials     3659     3656       -3     

Flag	Coverage Δ
Linux_1	28.99% <ø> (ø)
Linux_2	56.46% <ø> (ø)
Linux_3	39.18% <ø> (+<0.01%)	⬆️
Linux_4	28.90% <50.00%> (-0.01%)	⬇️
Windows_1	29.00% <ø> (?)
Windows_2	56.41% <ø> (ø)
Windows_3	39.18% <ø> (?)
Windows_4	28.90% <50.00%> (?)

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[zhongnansu]

Thanks for improving on MDS integration with core features. Could you add more details to the PR to explain what the script feature does, what's the issue, and what benefit does MDS integration bring us? Including a video or gif might help others to better understand! @raintygao