Compare GeoJSON assets in job result tests

[Silvren]

Summary

• recognize .geojson assets in assert_job_results_allclose instead of treating them as unhandled files
• compare feature attributes with the existing relative and absolute tolerances
• compare geometry types, geometry values, feature order, and coordinate reference systems through GeoPandas
• report attribute and geometry mismatches separately for actionable failures

Testing

• python -m pytest tests/testing -q (84 passed)
• pre-commit run --files CHANGELOG.md openeo/testing/results.py tests/testing/test_results.py

Fixes #862

[Silvren]

Thanks for the notification. I tried to inspect the Jenkins console, but jenkins.vgt.vito.be currently returns NXDOMAIN through both my system DNS and public DNS, so the console is not reachable from my network.

I reproduced the PR branch locally:

• python -m pytest tests/testing/test_results.py -q: 56 passed
• python -m pytest tests/testing -q: 84 passed
• git diff --check: passed

GitHub also shows two workflows awaiting maintainer approval. Could you please approve/re-run the workflows and retry the Jenkins build? If Jenkins still fails, sharing the first relevant traceback from the console would help me address it. Thanks!