Flaky: ActivityTimeoutTest redelivery test reads the per-minute dispatch window on the real clock #932

Tests\Feature\ActivityTimeoutTest::test_activity_redelivery_preserves_deadlines_without_new_attempt_or_dispatch reads the per-minute dispatch window (admission.activity_tasks.server_dispatch_count_this_minute) on the real clock. Its neighbours pin the clock with Carbon::setTestNow; this test does not. If the dispatch and the queue read fall in different wall-clock minutes, the count reads 0 and the test fails:

1) Tests\Feature\ActivityTimeoutTest::test_activity_redelivery_preserves_deadlines_without_new_attempt_or_dispatch
Failed asserting that 0 is identical to 1.
tests/Feature/ActivityTimeoutTest.php:503

Seen on #925 (run 41364820332, job 125022705099, head 6dd357f). That PR changes no PHP app, test or config file. Fix: pin Carbon::setTestNow early in the minute for the test's duration, as the neighbouring tests do, and reset it afterwards.

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