fix(harness): Report cases as we discover them

[epage]

This can run some level of discovery logic during discovery but more is needed for cases like tidy.rs

[coveralls]

Pull Request Test Coverage Report for Build 17657321438

Details

• 0 of 38 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 31.303%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/libtest2-harness/src/harness.rs	0	38	0.0%

Totals
Change from base Build 17650142642:	0.2%
Covered Lines:	483
Relevant Lines:	1543

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💛 - Coveralls