feat(eap): Add mutations topic to Snuba

[ayirr7]

Doing this separately so we can roll it out independently of the actual consumer: #6216

This will be rolled out after the schema is published getsentry/sentry-kafka-schemas#333

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
2557	1	2556	4

View the top 1 failed tests by shortest run time

tests.utils.streams.test_topics test_valid_topics

Stack Traces | 0.141s run time

Traceback (most recent call last):
  File ".../local/lib/python3.11....../site-packages/sentry_kafka_schemas/sentry_kafka_schemas.py", line 79, in get_topic
    with open(topic_path) as f:
         ^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '.../local/lib/python3.11.../sentry_kafka_schemas/topics/snuba-eap-mutations.yaml'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File ".../utils/streams/test_topics.py", line 10, in test_valid_topics
    sentry_kafka_schemas.get_topic(
  File ".../local/lib/python3.11....../site-packages/sentry_kafka_schemas/sentry_kafka_schemas.py", line 82, in get_topic
    raise SchemaNotFound
sentry_kafka_schemas.sentry_kafka_schemas.SchemaNotFound

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