Remove (unused) legacy test drivers

[jsiirola]

Fixes #3424 .

Summary/Motivation:

This removes some old (and as far as we can tell, unused) test drivers. The existance of a file called test_*.yaml runs afous of the pytest_mypy_plugin package.

Changes proposed in this PR:

• Delete unused testing files

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[blnicho]

Approved pending verification that the total number of tests hasn't changed with the removal of these files