chore(aci): Remove uses of workflow-engine-post-process-async flag

[kcons]

Nobody is opted out anymore, turning this off could pose significant operational risk to post_process, and any value as a kill switch is already covered by the more general opt-in flags.

[cursor]

Bug: TypedDict Access Causes KeyError for Optional Keys

The change from job.get() to direct dictionary access job[] for optional keys (group_state, has_reappeared, has_escalated) in the PostProcessJob TypedDict (defined with total=False) will cause KeyError exceptions when these keys are missing, instead of returning None.

src/sentry/tasks/post_process.py#L968-L971

sentry/src/sentry/tasks/post_process.py

Lines 968 to 971 in 20fb6bd

	group_id=job["event"].group_id,
	group_state=job["group_state"],
	has_reappeared=job["has_reappeared"],
	has_escalated=job["has_escalated"],

Fix in Cursor • Fix in Web

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[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
27212	2	27210	243

View the top 2 failed test(s) by shortest run time

tests.sentry.incidents.test_metric_issue_post_process.TestMetricDetectorPostProcess::test_occurrence_post_process

Stack Traces | 3.73s run time

#x1B[1m#x1B[.../sentry/incidents/test_metric_issue_post_process.py#x1B[0m:117: in test_occurrence_post_process
    assert mock_process_workflows.call_count == 1
#x1B[1m#x1B[31mE   AssertionError: assert 0 == 1#x1B[0m
#x1B[1m#x1B[31mE    +  where 0 = <MagicMock name='process_workflows' id='140142950133312'>.call_count#x1B[0m

tests.sentry.workflow_engine.test_integration.TestWorkflowEngineIntegrationFromIssuePlatform::test_workflow_engine__workflows

Stack Traces | 6.97s run time

#x1B[1m#x1B[.../sentry/workflow_engine/test_integration.py#x1B[0m:158: in test_workflow_engine__workflows
    mock_process_workflow.assert_called_once()
#x1B[1m#x1B[.../hostedtoolcache/Python/3.13.1.../x64/lib/python3.13/unittest/mock.py#x1B[0m:956: in assert_called_once
    raise AssertionError(msg)
#x1B[1m#x1B[31mE   AssertionError: Expected 'process_workflows' to have been called once. Called 0 times.#x1B[0m

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[saponifi3d]

the change lgtm, but looks like a test or two might need to be updated now