chore: add Prettier to dev workflow

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[codecov]

Codecov Report

Attention: Patch coverage is 95.38462% with 9 lines in your changes missing coverage. Please review.

Project coverage is 99.14%. Comparing base (9255f0b) to head (5a071c8).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...lickgrid/components/angular-slickgrid.component.ts	94.45%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master    #1511      +/-   ##
===========================================
- Coverage   100.00%   99.14%   -0.86%     
===========================================
  Files            7        7              
  Lines          952     1043      +91     
  Branches       321      399      +78     
===========================================
+ Hits           952     1034      +82     
- Misses           0        9       +9     

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