fix(cdc): remove cdc stuff for real

[volokluev]

spiritual successor to #6804

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
12	1	11	0

View the top 1 failed tests by shortest run time

::tests.pipeline.test_entity_processing_stage_composite

Stack Traces | 0s run time

Traceback (most recent call last):
  File ".../datasets/entities/factory.py", line 50, in get
    return self._entity_map[name]
           ~~~~~~~~~~~~~~~~^^^^^^
KeyError: EntityKey.GROUPEDMESSAGE

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File ".../tests/pipeline/test_entity_processing_stage_composite.py", line 63, in <module>
    EntityKey.GROUPEDMESSAGE, get_entity(EntityKey.GROUPEDMESSAGE).get_data_model()
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../datasets/entities/factory.py", line 86, in get_entity
    return _ent_factory().get(name)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../datasets/entities/factory.py", line 52, in get
    raise InvalidEntityError(f"entity {name!r} does not exist") from error
snuba.datasets.entities.factory.InvalidEntityError: entity EntityKey.GROUPEDMESSAGE does not exist

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[github-actions]

This PR has a migration; here is the generated SQL for ./snuba/migrations/groups.py ()

-- start migrations

-- forward migration events : 0007_groupedmessages
-- end forward migration events : 0007_groupedmessages




-- backward migration events : 0007_groupedmessages
-- end backward migration events : 0007_groupedmessages
-- forward migration events : 0008_groupassignees
-- end forward migration events : 0008_groupassignees




-- backward migration events : 0008_groupassignees
-- end backward migration events : 0008_groupassignees
-- forward migration events : 0010_groupedmessages_onpremise_compatibility
-- end forward migration events : 0010_groupedmessages_onpremise_compatibility




-- backward migration events : 0010_groupedmessages_onpremise_compatibility
-- end backward migration events : 0010_groupedmessages_onpremise_compatibility

[wedamija]

lgtm, we haven't used this in issues for a long time