fix: automatic checks file filter to be exclusion only to keep it simple

[mohanraj-r]

Bug Fixes 🐛

• automatic checks file filter to be exclusion only to keep it simple
  • the filter was trying to do both inclusion and exclusion which led to complicated buggy code
• add sa11y common pkg as dep instead of dev dep (fixes fix: missing pkg dependency of @sa11y/common #83)

[codecov]

Codecov Report

Merging #84 (b8e0092) into master (32b02b7) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #84   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          323       322    -1     
  Branches        58        57    -1     
=========================================
- Hits           323       322    -1     

Impacted Files	Coverage Δ
packages/jest/src/automatic.ts	100.00% <100.00%> (ø)

[venkatasadineni]

Looks Good To Me

[trevor-bliss]

Do we expect the filesFilter entries to be the full file paths? If so, it's probably better to do a string comparison (if not === then a startsWith or contains or similar) instead of using a regex. I see how regex made sense before since we let them use the ! negation, but to only exclude specific file paths I think a full regex is a little heavy handed.