ref(taskbroker): Add topic for example task activations

[evanh]

No description provided.

[github-actions]

Backend Test Failures

Failures on 8a796c8 in this run:

tests/sentry/conf/test_kafka_definition.py::test_topic_definition — log

.venv/lib/python3.13/site-packages/sentry_kafka_schemas/sentry_kafka_schemas.py:80: in get_topic
    with open(topic_path) as f:
E   FileNotFoundError: [Errno 2] No such file or directory: '/home/runner/work/sentry/sentry/.venv/lib/python3.13/site-packages/sentry_kafka_schemas/topics/taskworker-example.yaml'

During handling of the above exception, another exception occurred:
tests/sentry/conf/test_kafka_definition.py:18: in test_topic_definition
    assert sentry_kafka_schemas.get_topic(topic.value) is not None
.venv/lib/python3.13/site-packages/sentry_kafka_schemas/sentry_kafka_schemas.py:83: in get_topic
    raise SchemaNotFound
E   sentry_kafka_schemas.sentry_kafka_schemas.SchemaNotFound

tests/sentry/test_devimports.py::test_startup_imports[sentry_plugins] — log

tests/sentry/test_devimports.py:121: in test_startup_imports
    validate_package(pkg, EXCLUDED, XFAIL)
tests/sentry/test_devimports.py:116: in validate_package
    raise AssertionError(ret.stdout)
E   AssertionError: unexpected success importing sentry.web.debug_urls

tests/sentry/test_devimports.py::test_startup_imports[sentry] — log

tests/sentry/test_devimports.py:121: in test_startup_imports
    validate_package(pkg, EXCLUDED, XFAIL)
tests/sentry/test_devimports.py:116: in validate_package
    raise AssertionError(ret.stdout)
E   AssertionError: /home/runner/work/sentry/sentry/src/sentry/spans/consumers/process_segments/enrichment.py:38: DeprecationWarning: ATTRIBUTE_NAMES.SENTRY_BROWSER_NAME is deprecated.
E     ATTRIBUTE_NAMES.SENTRY_BROWSER_NAME,
E   unexpected success importing sentry.web.debug_urls

[markstory]

You're going to need to add this topic to getsentry first 😡