Resolve 30 skipped tests after all dependencies are installed and released correctly

[bobleesj]

30 tests are skipped when pyobjcryst, diffpy.structure, diffpy.srreal, sas are not installed.

Current result without installing the dependencies mentioned above:

conda create -n diffpy.srfit_312 python=3.12
conda activate diffpy.srfit_312
pip install -r requirement/run.txt  # scipy, numpy, matplotlib (at the moment)
pip install . --no-deps
pytest

====== 80 passed, 30 skipped, 1 warning in 0.43s =====

[sbillinge]

I think we don't want to skip these, so we just have CI install these things?

[bobleesj]

yes we don't want to, while we re-cookiecut, i will add these dependencies under run.txt and see what happens.

[bobleesj]

Discussed with @sbillinge in #89

• include optional dependencies such as diffpy.structure under run-ext.txt

[sbillinge]

reopening. Let's close when it is merged into main and fully resolved.