Add more path filters and manual triggers to GitHub Actions workflows

[jdblischak]

I noticed that in my previous PR to fix a minor formatting typo that a lot of CI was run (#7276). To reduce the required resources and also increase the speed of development, I added some more path-based filters to the GitHub Actions workflow triggers. Specifically:

• Only run rchk if a file in src/ is updated
• Only run coverage if a file in inst/tests/, R/, src/, or tests/ is updated

I also added the manual trigger workflow_dispatch. This is convenient when preparing a PR. As a developer, I can manually run a workflow on my feature branch in my feedstock (ie not the master branch), prior to opening the PR.

I didn't add any path filters to code-quality.yaml or R-CMD-check.yaml so that a baseline of CI is still run for every PR, but I could add them if requested.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.01%. Comparing base (6e63f5b) to head (51bb553).
⚠️ Report is 23 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7280   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files          81       81           
  Lines       15503    15503           
=======================================
  Hits        15351    15351           
  Misses        152      152           

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[jdblischak]

Thank you for the reviews @jangorecki and @Anirban166. Are there any additional steps you would like me to take before merging this PR?

[jangorecki]

Probably nothing, it is waiting for someone who has commit rights and feels fine to take responsibility for fixing problems if something will go wrong...