[Auto Suggest] Fix Grammar Changes

[paulstn]

Description

Redos changes made to the grammar meant for fixing bugs. Fixes those same original bugs through other means.

Also rewrites the 'redo and combine' functionality to be more robust.

Issues Resolved

Screenshot

Testing the changes

Changelog

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

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 5.69620% with 149 lines in your changes missing coverage. Please review.

Project coverage is 60.72%. Comparing base (89265b6) to head (e9fff9a).
Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntlr/opensearch_sql/opensearch_sql_autocomplete.ts	5.88%	31 Missing and 1 partial ⚠️
src/plugins/data/public/antlr/shared/utils.ts	13.88%	30 Missing and 1 partial ⚠️
...ntlr/opensearch_ppl/opensearch_ppl_autocomplete.ts	0.00%	29 Missing ⚠️
...ata/public/antlr/opensearch_sql/code_completion.ts	0.00%	28 Missing ⚠️
...ata/public/antlr/opensearch_ppl/code_completion.ts	0.00%	16 Missing ⚠️
...s/data/public/autocomplete/autocomplete_service.ts	0.00%	12 Missing ⚠️
...ugins/data/public/ui/query_editor/query_editor.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9120      +/-   ##
==========================================
- Coverage   60.87%   60.72%   -0.15%     
==========================================
  Files        3802     3808       +6     
  Lines       91060    91438     +378     
  Branches    14370    14455      +85     
==========================================
+ Hits        55435    55529      +94     
- Misses      32085    32355     +270     
- Partials     3540     3554      +14     

Flag	Coverage Δ
Linux_1	28.88% <2.54%> (-0.14%)	⬇️
Linux_2	56.38% <ø> (-0.01%)	⬇️
Linux_3	37.84% <5.69%> (?)
Linux_4	28.88% <2.54%> (-0.12%)	⬇️
Windows_1	28.89% <2.54%> (-0.14%)	⬇️
Windows_2	56.34% <ø> (-0.01%)	⬇️
Windows_3	37.84% <5.69%> (-0.07%)	⬇️
Windows_4	28.88% <2.54%> (-0.12%)	⬇️

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