chore: add a bit more SlickGrid tests and add some Prettier ignore

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[codecov]

Codecov Report

Attention: Patch coverage is 95.70957% with 26 lines in your changes missing coverage. Please review.

Project coverage is 99.8%. Comparing base (f2c273b) to head (f59461a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/common/src/core/slickGrid.ts	91.7%	26 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1784     +/-   ##
========================================
+ Coverage    99.7%   99.8%   +0.2%     
========================================
  Files         187     187             
  Lines       35055   34035   -1020     
  Branches    10271   10107    -164     
========================================
- Hits        34926   33947    -979     
+ Misses        129      88     -41     

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