8273 remove custom Ava glob

[turadg]

closes: #8273

Description

#8653 adopted the new glob but left the old one so any in-flight PRs with new tests wouldn't have them ignored.

It's been a month so any should be migrated by now. This removes the old glob.

It doesn't remove the "files" option entirely, because the default glob is everything under test and we have files there that aren't tests. Ava warns they're not tests and and eslint errors when tests import from them. We could go fully to the default glob by using an underscore prefixes on files in test that aren't tests. I don't think we need to do that. This change already meets the goal of matching the DX of Ava in other repos. (Test filenames are indicated by a .test.js suffix)

Security Considerations

n/a

Scaling Considerations

n/a

Documentation Considerations

reduces need to document

Testing Considerations

no older test files in master (find packages -name 'test-*' |grep 'test/')

Upgrade Considerations

n/a

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