Block background TaskWatchdog from racing testActivityRetriesBeforeResumingWorkflow

Same CI-flake pattern 50028c9 fixed for two other tests: the testbench queue
workers' wake() poll calls TaskWatchdog::runPass in a separate PHP process
with a real-time now(). This test sets Carbon to 2026-04-09, so every Ready
task it drives through the DB carries a created_at ten real-time-days in
the past. TaskRepairPolicy::dispatchOverdue reads any task whose created_at
is more than redispatchAfterSeconds (3s) behind now() as overdue, so the
background worker redispatches the task via the real Bus (Queue::fake only
intercepts the test process's queue), and a worker then claims it before
the test's next runReadyTaskForRun() lookup lands — "Expected a ready
workflow task for run ..." at V2WorkflowTest:8194.

Pre-setting LOOP_THROTTLE_KEY for 60s makes any background wake() in that
window short-circuit at the throttle check, matching the pattern already
used for testActivityHeartbeatRenewsCurrentAttemptLease and
testRepairRecreatesMissingParentResumeTaskFromChildResolutionHistory.

Verified 15/15 green locally against the same docker stack that previously
reproduced ~10% flake (1/10 failing runs before the fix).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: durable-workflow-ops

tests/Feature/V2/V2WorkflowTest.php

@@ -1079,6 +1079,14 @@ public function testReplayBlocksTerminalChildProjectionWithoutTypedParentStepHis
 
     public function testActivityRetriesBeforeResumingWorkflow(): void
     {
+        // Block the background TaskWatchdog so the testbench queue workers'
+        // wake() poll doesn't race our Queue::fake-driven Ready tasks. Each
+        // runReadyTaskForRun() creates a new Ready task whose created_at is
+        // stamped with the test's Carbon clock (2026-04-09), which reads as
+        // "overdue by days" from the worker's real-time now() and triggers a
+        // redispatch that can race with the test's direct handle() invocation.
+        Cache::put(TaskWatchdog::LOOP_THROTTLE_KEY, true, 60);
+
         Queue::fake();
         Carbon::setTestNow(Carbon::parse('2026-04-09 12:00:00'));