update checklist for new pull requests

[zacharyburnett]

restructure the pull request checklist to be more useful and less clunky

old checklist

Checklist

• [ ] for a public change, added a towncrier news fragment in changes/:

  echo "changed something" > changes/<PR#>.<changetype>.rst

  • changes/<PR#>.apichange.rst: change to public API
  • changes/<PR#>.bugfix.rst: fixes an issue
  • changes/<PR#>.general.rst: infrastructure or miscellaneous change
• [ ] updated relevant tests
• [x] updated relevant documentation
• [ ] updated relevant milestone(s)
• [x] added relevant label(s)

new checklist

Tasks

• [ ] update or add relevant tests
• [x] update relevant docstrings and / or docs/ page
• [ ] Does this PR change user-facing code / API? (if not, label with no-changelog-entry-needed)
  • [ ] write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types)
  • [ ] run regression tests with this branch installed ("git+https://github.com/<fork>/stcal@<branch>")
  • [ ] jwst regression test
  • [ ] romancal regression test

news fragment change types...

- ``changes/.apichange.rst``: change to public API - ``changes/.bugfix.rst``: fixes an issue - ``changes/.general.rst``: infrastructure or miscellaneous change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.65%. Comparing base (d85f859) to head (53e7393). Report is 14 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #288 +/- ## ========================================== + Coverage 84.63% 84.65% +0.02% ========================================== Files 41 41 Lines 7628 7651 +23 ========================================== + Hits 6456 6477 +21 - Misses 1172 1174 +2 ```

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