Disable the Hypothesis deadline on the copartitioned-assignor property tests

[wbarnha]

Description

The Python pypy3.11/Cython: false CI leg fails intermittently on tests/meticulous/assignor/test_copartitioned_assignor.py, with an error that is about timing rather than about assignment correctness:

hypothesis.errors.FlakyFailure: Hypothesis test_remove_clients(
    partitions=243, replicas=62, num_clients=686, num_removal_clients=1
) produces unreliable results: Failed on the first call but did not on a
subsequent one

Unreliable test timings! On an initial run, this test took 5061.03ms, which
exceeded the deadline of 4000.00ms, but on a subsequent run it took
3483.45ms, which did not. If you expect this sort of variability in your test
timings, consider turning deadlines off for this test by setting
deadline=None.

These four property tests assert that the assignment produced is valid, not that it is produced within any particular time. PyPy's JIT warmup makes a single example's timing vary by well over a second, so a fixed 4000 ms deadline is tripped intermittently even though the assignment is correct. This sets TEST_DEADLINE = None; the job's own timeout still guards against a real hang.

Why this is worth landing on its own

This branch already existed with the fix but no PR, so the flake keeps failing unrelated PRs. It is not a hypothetical:

• It failed the PyPy leg on Add three Cython accelerators: offset commit, record scheduler, sensor fan-out #751 and, independently, on Evaluate a feature-flagged Rust accelerator build #749 — same test, same generated example (partitions=243, replicas=62, num_clients=686, num_removal_clients=1), 5061 ms and 5154 ms against the same 4000 ms deadline.
• Those two branches share only the library code, and neither touches faust/assignor/ or tests/meticulous/.
• Hypothesis shrinks to the same slow example on every run, so it does not clear on its own.

Both of those PRs currently carry 2f04895, a cherry-pick of this branch's commit, purely to get their CI green. Once this lands they can drop it, or it merges as a no-op since the change is identical.

Testing

Full suite passes (2207 passed, 4 skipped). The four assignor property tests pass with the deadline removed, and the PyPy leg is green on both PRs carrying the cherry-pick.

Branch was 15 commits behind; master has been merged in so CI runs against the current base.

🤖 Generated with Claude Code

https://claude.ai/code/session_019oX4oGCQGgvPJHabjwfaBk

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Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.06%. Comparing base (803c7a4) to head (a9ec7d9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #752   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files         103      103           
  Lines       11072    11072           
  Branches     1191     1191           
=======================================
  Hits        10636    10636           
  Misses        345      345           
  Partials       91       91           

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