Fix: improve VBScript folding logic: handle double keywords

[mkslanc]

Issue #, if available: #5852

Description of changes:

• All double keywords loops (do... while/ do... until) should be handled for matching/folding/indenting
• Removed wrong fold widget on Exit... constructions
• Fix: not return Ranges case when cursor is in between of two keywords like End if

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

[codecov]

Codecov Report

❌ Patch coverage is 92.69406% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.71%. Comparing base (19f426e) to head (32fd491).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/mode/folding/vbscript.js	86.95%	15 Missing ⚠️
src/mode/vbscript.js	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5911      +/-   ##
==========================================
+ Coverage   87.65%   87.71%   +0.06%     
==========================================
  Files         621      621              
  Lines       45591    45768     +177     
  Branches     7592     7624      +32     
==========================================
+ Hits        39963    40146     +183     
+ Misses       5628     5622       -6     

Flag	Coverage Δ
unittests	87.71% <92.69%> (+0.06%)	⬆️

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