speed up cli responsiveness

[atravitz]

as raised by @dwhswenson - calling the command line is taking ~5s as of v1.11. This PR rearranges some imports so that we're back to aroudn ~0.4 seconds.

Checklist

• All new code is appropriately documented (user-facing code must have complete docstrings).
• Added a news entry, or the changes are not user-facing.
• Ran pre-commit: you can run pre-commit locally or comment on this PR with pre-commit.ci autofix.

Manual Tests: these are slow so don't need to be run every commit, only before merging and when relevant changes are made (generally at reviewer-discretion).

• GPU integration tests
• example notebook testing
• packaging tests: run this for any large feature PRs or PRs that add test data.

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.97%. Comparing base (d60fb8e) to head (aa82e09).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/openfecli/commands/test.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1972   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files         216      216           
  Lines       20480    20481    +1     
=======================================
+ Hits        19451    19452    +1     
  Misses       1029     1029           

Flag	Coverage Δ
fast-tests	90.51% <63.63%> (?)
slow-tests	94.94% <63.63%> (-0.04%)	⬇️

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[github-actions]

No API break detected ✅

[dwhswenson]

Confirmed locally that this speeds up CLI! Thanks!

Pretty much the changes I expected, too. I note that CodeCov complaints are because the download_only option isn't tested, which seems to be an existing miss, not a new regression (just that some imports got moved in there).