[SCSB-224] dynamically test Python versions based on Python version pins in metadata (requires-python)

[zacharyburnett]

Resolves SCSB-224

uses and blocked by OpenAstronomy/github-actions-workflows#326

Tasks

• If you have a specific reviewer in mind, tag them.
• add a build milestone, i.e. Build 12.0 (use the latest build if not sure)
• 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 changelog readme for instructions)
  • update or add relevant tests
  • update relevant docstrings and / or docs/ page
  • start a regression test and include a link to the running job (click here for instructions)
    • Do truth files need to be updated ("okified")?
      • after the reviewer has approved these changes, run okify_regtests to update the truth files
• if a JIRA ticket exists, make sure it is resolved properly

[zacharyburnett]

it works!

[zacharyburnett]

changed the OpenAstronomy PR to include parameters and the ability to add envs to existing env list:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.52%. Comparing base (717fd5e) to head (146a188).
⚠️ Report is 260 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10003   +/-   ##
=======================================
  Coverage   85.52%   85.52%           
=======================================
  Files         366      366           
  Lines       38029    38029           
=======================================
  Hits        32526    32526           
  Misses       5503     5503           

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