ref: delete dead KeyedVariants / KeyedList

[asottile-sentry]

No description provided.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
25290	1	25289	314

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

tests.snuba.api.endpoints.test_organization_events_stats_span_indexed.OrganizationEventsEAPRPCSpanEndpointTest::test_downsampling_can_go_to_higher_accuracy_tier

Stack Traces | 15.7s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_events_stats_span_indexed.py#x1B[0m:2008: in test_downsampling_can_go_to_higher_accuracy_tier
    assert response.data["meta"]["dataScanned"] == "partial"
#x1B[1m#x1B[31mE   AssertionError: assert 'full' == 'partial'#x1B[0m
#x1B[1m#x1B[31mE     #x1B[0m
#x1B[1m#x1B[31mE     - partial#x1B[0m
#x1B[1m#x1B[31mE     + full#x1B[0m

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