chore(gates): run the viewport read test on the iOS PR lane

Author: okwasniewski

.github/workflows/ios.yml

@@ -247,6 +247,7 @@ jobs:
             -only-testing:AgentDeviceRunnerUITests/RunnerTests/testPartialCustomActionPassIsDisclosedAndCompleteOneIsNot \
             -only-testing:AgentDeviceRunnerUITests/RunnerTests/testActionNamesAreCappedPerElementAndReported \
             -only-testing:AgentDeviceRunnerUITests/RunnerTests/testHungCustomActionReadIsContainedAndRecovers \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testAbandonedSnapshotViewportReadOccupiesMainThreadUntilDrained \
             -only-testing:AgentDeviceRunnerUITests/RunnerTests/testPrivateAXPinnedRegularDepthReachesAcquisitionAndPresentation 2>&1 | tee /tmp/agent-device-runner-regressions.log
           node --input-type=module -e '
             import { readFileSync } from "node:fs";