fix: return empty result for empty test suite

[agostbiro]

Make sure we return an empty test suite result for empty test suites.

The fix changes the semantics of the TestFilter slightly, hence the need for the change to crates/edr_solidity_tests/tests/it/fork.rs, but since the TestFilter isn't exposed (it's only used in integration tests), I think this is ok.

The change in semantics is that previously we only returned results for a test suite if the test name filter also matched at least one test name in the test suite. Now we return an empty result instead if the path filter and suite name filter match, but the test name filter doesn't match.

Fixes #702

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[galargh]

Great, thanks - this is going to be really helpful on the hardhat side 🙇