Replace ace workers with ace-legacy-linters

[mkslanc]

Issue #, if available: #4946 #5256 #3901 #3747 #3479 #5854

Description of changes:

• Drop-in replacements for legacy workers. Should handle most of worker-related issues for those, who don't want to use separate language client or need simple diagnostics.
• Add diagnostics support additionally for less and scss

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

Open kitchen-sink @ 76cdf283f24ff68b419ac21588bf9d2cad1ccfd2

Open kitchen-sink @ 622a87103dd645053583d95c54585c178b04f613

Open kitchen-sink @ af6e826645eefd2593bf9f51842fbdef9d4f1cb4

Open kitchen-sink @ 62e948f298b8d9490d3c8e6dd2f3864375b960c2

[codecov]

Codecov Report

❌ Patch coverage is 87.87879% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.72%. Comparing base (a467a6c) to head (62e948f).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/mode/less.js	88.23%	2 Missing ⚠️
src/mode/scss.js	87.50%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #5938    +/-   ##
========================================
  Coverage   93.72%   93.72%            
========================================
  Files         634      640     +6     
  Lines      137322   137772   +450     
  Branches    14469    14475     +6     
========================================
+ Hits       128708   129131   +423     
- Misses       8614     8641    +27     

Flag	Coverage Δ
unittests	93.72% <87.87%> (+<0.01%)	⬆️

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