test(installer): split integration tests into one #[test] per fixture

Replace the three loop-based test functions (each iterating all
fixtures with a shared SKIP_INSTALLER_* skip list) with macro-generated
per-fixture test functions, so a single failing or panicking fixture
no longer hides the pass/fail status of the rest. Known-failing
fixtures keep their TODO(phase-d) reasons via #[ignore] on their own
test instead of a shared skip list. All generated tests are #[serial]
since they mutate global env vars (COMPOSER_POOL_OPTIMIZER,
COMPOSER_FUND) that would otherwise race across parallel test threads.

This is an interim structure for triaging the ~131 ignored fixtures
one at a time; it should be reverted to a single loop-based test per
group (matching Composer's directory-scanned fixtures) once they are
resolved.

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