Add integration tests

[jlaehne]

Add test run with hyperspy and its extensions installed. Run rosettasciio, hyperspy and extension tests.

Progress of the PR

• Change implemented (can be split into several points),
• [n/a] update docstring (if appropriate),
• [n/a] update user guide (if appropriate),
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:rosettasciio build of this PR (link in github checks)
• add tests,
• ready for review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.00%. Comparing base (f3d59ca) to head (b7b47df).
⚠️ Report is 77 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #388      +/-   ##
==========================================
- Coverage   88.02%   88.00%   -0.02%     
==========================================
  Files          91       91              
  Lines       11538    11538              
  Branches     2131     2131              
==========================================
- Hits        10156    10154       -2     
- Misses        875      876       +1     
- Partials      507      508       +1     

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[ericpre]

Just ran the workflow in hyperspy: https://github.com/hyperspy/hyperspy/actions/runs/14291193279/job/40052635962 and there are a few test suite that fails and from a quick look, it seems to be related to an issues in the test suite of the extension.

For now, a pragmatic approach could be to skip these test suite, until this is fixed - running rosettasciio test suite with the extension installed is already an improvement and useful.

At some point, it would be good to see if reusable workflow can be used, otherwise, this can be end up being a maintenance burden or not working most of the time!

[jlaehne]

Indeed, it is probably enough to run the Rosetta tests with extensions installed here and leave further integration tests to HyperSpy.

[ericpre]

Should it be documented somewhere, pull request template or contributor guide?

[jlaehne]

Superseded by #426