1156 test scaling

[IngridKJ]

Proposed changes

This PR addresses #1156 and concerns testing of scaling in the model classes in PorePy (fluid mass balance, energy balance, momentum balance etc.). Specifically, the tests that are altered are the test_unit_conversion tests. They are now using nontrivial material parameter values. The values are stored in fluid_values.py and solid_values.py in the dictionaries "extended_X_values_for_testing", where X is either water or granite.

Types of changes

What types of changes does this PR introduce to PorePy?

• [ ] Minor change (e.g., dependency bumps, broken links).
• [ ] Bugfix (non-breaking change which fixes an issue).
• [ ] New feature (non-breaking change which adds functionality).
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected).
• [x] Testing (contribution related to testing of existing or new functionality).
• [ ] Documentation (contribution related to adding, improving, or fixing documentation).
• [ ] Maintenance (e.g., improve logic and performance, remove obsolete code).
• [ ] Other:

Checklist

• [x] The documentation is up-to-date.
• [x] Static typing is included in the update.
• [x] This PR does not duplicate existing functionality.
• [x] The update is covered by the test suite (including tests added in the PR).
• [ ] If new skipped tests have been introduced in this PR, pytest was run with the --run-skipped flag.