chore: migrate CI to GH actions (core checks)

[mdjastrzebski]

Summary

Our Circle CI setup stopped working correctly, and after conversation with @thymikee we decided to move to GH actions. This PR addresses moving the basic jobs there:

• Lint
• TypeScript
• Tests
• Flow
• Tests Website
• Tests React 17
• Codecov

A separate PR will be made for job responsible for publishing GH docs.

Test plan

All jobs pass

[codecov]

Codecov Report

Base: 94.94% // Head: 95.13% // Increases project coverage by +0.18% 🎉

Coverage data is based on head (10f9ea8) compared to base (e38c627).
Patch coverage: 98.61% of modified lines in pull request are covered.

❗ Current head 10f9ea8 differs from pull request most recent head c90ddcd. Consider uploading reports for the commit c90ddcd to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1280      +/-   ##
==========================================
+ Coverage   94.94%   95.13%   +0.18%     
==========================================
  Files          45       46       +1     
  Lines        3088     3205     +117     
  Branches      457      483      +26     
==========================================
+ Hits         2932     3049     +117     
  Misses        156      156              

Impacted Files	Coverage Δ
src/queries/text.ts	97.67% <93.33%> (+0.37%)	⬆️
src/config.ts	100.00% <100.00%> (ø)
src/fireEvent.ts	98.65% <100.00%> (ø)
src/helpers/accessiblity.ts	100.00% <100.00%> (ø)
src/helpers/host-component-names.tsx	100.00% <100.00%> (ø)
src/helpers/matchers/matchTextContent.ts	100.00% <100.00%> (ø)
src/queries/displayValue.ts	100.00% <100.00%> (ø)
src/queries/placeholderText.ts	100.00% <100.00%> (ø)
src/queries/role.ts	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.