Expand CI pytest reporting config to ignore xfails

[ksunden]

PR summary

Pytest 8 brought with it an expansion of the reporting for xfails (and xpasses)
which with our current config (-ra) on CI renders the reports rather difficult to
read. This is because we have quite a lot of xfails, for various reasons:

• We have many that are very intentional and are testing our test fixures and explicitly pass strict=True
• We have things like the recent templated out tests for units behavior that introduced many xfails at once

As a result seeing the output on xfails is not particularly useful for us, especially.

As x is included in the a (all) option, we are left to expand out all of the components that we do want, which is a little messy.

Unfortuntately there is not a toggle that still gets us the one line "this test xfails" without
providing the full output, which I probably would use if available.

I was borderline on whether or not to remove the xpasses (X). As there are not that many of them in my experience and output was not present at least for those that xpassed for me locally I decided that keeping the one line summary was useful.
My reading of the discussion around the addition of this feature to pytest indicates that output would be included if present, but since generally xpassing mostly means we are not getting an exception, I think cases where output is produced are likely relatively rare (and honestly most likely on the strict mode tests that would fail the suite and cause us to look in the first place).

I considered moving all of these to --add-opts in the pyproject.toml config, but opted to just do the minimal change that would not affect dev machines, just CI.

PR checklist

• "closes #0000" is in the body of the PR description to link the related issue
• new and changed code is tested
• Plotting related features are demonstrated in an example
• New Features and API Changes are noted with a directive and release note
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