Matan Lurey 842e2fe8f1 Migrate off a global test fixture for build and lint. (flutter/engine#55540)
Partial work towards https://github.com/flutter/flutter/issues/148420, unblocks https://github.com/flutter/engine/pull/55537.

These tests can now be more precise, and changing the fixtures no longer has side-effects on tests across the entire repository. There are about 11 other usages (there were ~50 in these) after this PR that I'll get to, as well as the hard-coded `gn desc` output, before retiring `fixtures.dart`
2024-10-01 16:29:51 +00:00
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