feat(workflow_engine): Hook up activity updates to process_workflows

[saponifi3d]

Description

Complete support for Activity updates from the issue platform. This will filter to known activities that we can handle (right now, it's just issue resolution).

• Needed to fix a few areas of logic to support the full end to end of process_workflows with an activity update.
• Added Tests to ensure we could create an activity, run the task and it will fetch any associated data an evaluate as exected.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: src/sentry/workflow_engine/processors/workflow.py

Function	Unhandled Issue
evaluate_workflows_action_filters	SoftTimeLimitExceeded: SoftTimeLimitExceeded('SoftTimeLimitExceeded()\nSQL: SELECT "workflow_engine_workflow"."id", "workflow_engine_workflow"."date_updated", "workflow_engine_workflow"."date_added", "workflow_engine_workflow"."config", "workflow_engine_workflow"."owner_user_... ... Event Count: 2

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[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
27137	2	27135	247

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

tests.sentry.workflow_engine.test_task_integration.IssuePlatformIntegrationTests::test_handler_invoked__when_resolved

Stack Traces | 2.25s run time

#x1B[1m#x1B[.../sentry/workflow_engine/test_task_integration.py#x1B[0m:69: in test_handler_invoked__when_resolved
    mock_incr.assert_called_with(
#x1B[1m#x1B[.../hostedtoolcache/Python/3.13.1.../x64/lib/python3.13/unittest/mock.py#x1B[0m:977: in assert_called_with
    raise AssertionError(_error_message()) from cause
#x1B[1m#x1B[31mE   AssertionError: expected call not found.#x1B[0m
#x1B[1m#x1B[31mE   Expected: incr('workflow_engine.process_workflow.activity_update', tags={'activity_type': 1})#x1B[0m
#x1B[1m#x1B[31mE     Actual: incr('jobs.all.dispatched', skip_internal=False)#x1B[0m

tests.sentry.workflow_engine.test_task_integration.IssuePlatformIntegrationTests::test_handler_invoked__when_update_status_called

Stack Traces | 2.41s run time

#x1B[1m#x1B[.../sentry/workflow_engine/test_task_integration.py#x1B[0m:47: in test_handler_invoked__when_update_status_called
    mock_incr.assert_called_with(
#x1B[1m#x1B[.../hostedtoolcache/Python/3.13.1.../x64/lib/python3.13/unittest/mock.py#x1B[0m:977: in assert_called_with
    raise AssertionError(_error_message()) from cause
#x1B[1m#x1B[31mE   AssertionError: expected call not found.#x1B[0m
#x1B[1m#x1B[31mE   Expected: incr('workflow_engine.process_workflow.activity_update', tags={'activity_type': 1})#x1B[0m
#x1B[1m#x1B[31mE     Actual: incr('jobs.all.dispatched', skip_internal=False)#x1B[0m

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