Add fallback filtering for compatibility so that AIs can actually run single tests or groups

[JohnGalt1717]

Right now no AI can run a single TUnit test. They're incapable of doing so, and having to teach them every single time (because they ignore it in the copilot-instructions.md as an example) is exhausting and this is one case where AI can do a good job writing and testing tests.

Please add the standard xunit/nunit syntax for filtering in addition to the tree stuff that's in the docs.

[thomhurst]

Custom filters need to be opened up by the Microsoft Test Platform: https://github.com/microsoft/testfx/issues/3590

[JohnGalt1717]

Thanks! Tracking.

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