GraalPy: collect_until's late-finaliser test outruns its 5 s grace #2016

Describe the bug
On GraalPy, FinaliserBackstopWithoutDel.test_collect_until_waits_out_a_finaliser_that_runs_late in tests/foundation/test_extraction_ownership.py fails: collect_until(late, grace=5.0) returns False. The predicate needs three collections, and under the loaded sharded run, GraalPy does not fit three gc.collect calls into the hard-coded 5 s.

Reproduction
The graalpy-25.4 experimental leg on main f96a6b156 (job):

>       self.assertTrue(collect_until(late, grace=5.0))
E       AssertionError: False is not true

Expected behavior
The test should check how collect_until behaves without depending on how fast gc.collect runs on the engine.

System information

• OS Version: ubuntu-latest (GitHub Actions)
• Python Implementation: GraalPy 25.4
• commit: f96a6b156

Additional context
This came out of the #1963 re-measure. collect_until came from #2010.