fix: Event sink errors when enabled models are missing

[bmtcril]

When event sinks are enabled in the config or waffle flag, but the model itself doesn't exist we were throwing errors that caused downstream errors. We now warn on this condition and return the model as disabled instead.

Still needs manual testing, leaving in draft for now.

Closes: #96

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
platform_plugin_aspects
__init__.py
platform_plugin_aspects/sinks
base_sink.py					365-368
Project Total

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[Ian2012]

@bmtcril Tested locally by removing the course_enrollment entry from EVENT_SINK_CLICKHOUSE_MODEL_CONFIG

lms-1  | 2024-10-04 20:38:14,936 INFO 113 [tracking] [user 6] [ip 172.18.0.1] logger.py:41 - {"name": "edx.course.enrollment.activated", "context": {"user_id": 6, "path": "/change_enrollment", "course_id": "course-v1:OpenedX+DemoX+DemoCourse", "org_id": "OpenedX", "enterprise_uuid": ""}, "username": "admin", "session": "dc1fef98626413e0576e133d403b0062", "ip": "172.18.0.1", "agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36", "host": "local.edly.io:8000", "referer": "http://local.edly.io:8000/courses/course-v1:OpenedX+DemoX+DemoCourse/about", "accept_language": "en-US,en;q=0.9,es;q=0.8", "event": {"user_id": 6, "course_id": "course-v1:OpenedX+DemoX+DemoCourse", "mode": "audit"}, "time": "2024-10-04T20:38:14.522547+00:00", "event_type": "edx.course.enrollment.activated", "event_source": "server", "page": null}
lms-1  | 2024-10-04 20:38:14,945 INFO 113 [celery.app.trace] [user 6] [ip 172.18.0.1] trace.py:128 - Task platform_plugin_aspects.tasks.dump_data_to_clickhouse[914fb4b7-e719-4a88-b5bb-6d4bbbeccf35] succeeded in 0.0012879549994977424s: 'Disabled'