Good first issue: use concrete error messages for wgpu-test tests

[ErichDonGubler]

After merging #5290, there are many tests in tests/tests/ that do not specify the text of the expected validation error. This is actually a hole in coverage; if the reason for validation changes, it could potentially be a regression of coverage. We wouldn't be able to detect this without actually checking the content of the validation error!

We should narrow expected validation error texts for these tests.

@ErichDonGubler is happy to act as a mentor for whoever wants to take this on. 🙂

[dv29]

can i work on this?

[cwfitzgerald]

Sure!

[dv29]

@ErichDonGubler looking for feedback on 6016. I did just one to see if this is correct and/or what need to be changed before i replicate for others