feat(taskworker): add routing override

[john-z-yang]

Adds an automator modifiable config taskworker.route.overrides so we can override the routing during emergency.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
327	1	326	11

View the top 1 failed test(s) by shortest run time

::tests.sentry.taskworker.test_worker

Stack Traces | 0s run time

#x1B[1m#x1B[.../sentry/taskworker/test_worker.py#x1B[0m:14: in <module>
    import sentry.taskworker.tasks.examples as example_tasks
#x1B[1m#x1B[.../taskworker/tasks/examples.py#x1B[0m:11: in <module>
    exampletasks = taskregistry.create_namespace(name="examples")
#x1B[1m#x1B[.../sentry/taskworker/registry.py#x1B[0m:194: in create_namespace
    topic = self._router.route_namespace(name)
#x1B[1m#x1B[.../sentry/taskworker/router.py#x1B[0m:17: in route_namespace
    if name in options.get("taskworker.route.overrides"):
#x1B[1m#x1B[.../sentry/options/manager.py#x1B[0m:301: in get
    result = self.store.get(opt, silent=silent)
#x1B[1m#x1B[.../sentry/options/store.py#x1B[0m:97: in get
    result = self.get_store(key, silent=silent)
#x1B[1m#x1B[.../sentry/options/store.py#x1B[0m:193: in get_store
    value = self.model.objects.get(key=key.name).value
#x1B[1m#x1B[31m.venv/lib/python3.13.../db/models/manager.py#x1B[0m:87: in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
#x1B[1m#x1B[31m.venv/lib/python3.13.../db/models/query.py#x1B[0m:645: in get
    num = len(clone)
#x1B[1m#x1B[31m.venv/lib/python3.13.../db/models/query.py#x1B[0m:382: in __len__
    self._fetch_all()
#x1B[1m#x1B[31m.venv/lib/python3.13.../db/models/query.py#x1B[0m:1928: in _fetch_all
    self._result_cache = list(self._iterable_class(self))
#x1B[1m#x1B[31m.venv/lib/python3.13.../db/models/query.py#x1B[0m:91: in __iter__
    results = compiler.execute_sql(
#x1B[1m#x1B[31m.venv/lib/python3.13.../models/sql/compiler.py#x1B[0m:1572: in execute_sql
    cursor = self.connection.cursor()
#x1B[1m#x1B[31m.venv/lib/python3.13.../django/utils/asyncio.py#x1B[0m:26: in inner
    return func(*args, **kwargs)
#x1B[1m#x1B[31m.venv/lib/python3.13.../backends/base/base.py#x1B[0m:320: in cursor
    return self._cursor()
#x1B[1m#x1B[.../db/postgres/decorators.py#x1B[0m:40: in inner
    return func(self, *args, **kwargs)
#x1B[1m#x1B[.../db/postgres/base.py#x1B[0m:108: in _cursor
    return super()._cursor()
#x1B[1m#x1B[31m.venv/lib/python3.13.../backends/base/base.py#x1B[0m:296: in _cursor
    self.ensure_connection()
#x1B[1m#x1B[31mE   RuntimeError: Database access not allowed, use the "django_db" mark, or the "db" or "transactional_db" fixtures to enable it.#x1B[0m

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