Disable Unexpected trailing comma rule

[mkslanc]

Issue #, if available:

Description of changes:

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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

All modified and coverable lines are covered by tests ✅

Project coverage is 86.97%. Comparing base (560f5d3) to head (c8b904c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5660   +/-   ##
=======================================
  Coverage   86.97%   86.97%           
=======================================
  Files         594      594           
  Lines       43395    43395           
  Branches     7170     7170           
=======================================
  Hits        37742    37742           
  Misses       5653     5653           

Flag	Coverage Δ
unittests	86.97% <ø> (ø)

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