73: update .toml to enable pytest-cov report

[John-Sharples]

In this PR some general tidy up of the existing github action:

• update branches that trigger actions to include any that start with an issue number and a dash ( e.g. 14-some-string)
• Change unit test job to include coverage report.
• move pytest/coverage config items to pyproject.toml this fixes the current error in actions where coverage can't find a test report.
• Above change also introduces a coverage check. Pytest will fail if coverage drops below 98%. Do we want this?
• Add h5netcdf to dev requirements, it's needed to run tests (specifically test_murphy.py)

I'll keep issue #73 open, as there is more to do. But this PR can go in now as these changes will be usful for everyone.

[John-Sharples]

See here for example output https://github.com/John-Sharples/scores/actions/runs/6540346623

[tennlee]

This looks great. I think we should consider whether 98 to 100 is what should be required for coverage (I would probably vote for 100 with in-line nocov comments with an explanation), but the change looks very helpful as-is.