feat(anomaly detection): backend call for historical anomalies endpoint

[mifu67]

Replace the dummy function with the real Seer call.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
21633	1	21632	205

View the top 1 failed tests by shortest run time

tests.sentry.api.endpoints.test_organization_events_anomalies.OrganizationEventsAnomaliesEndpointTest test_simple

Stack Traces | 4.77s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_events_anomalies.py#x1B[0m:43: in test_simple
    assert resp.data == [
#x1B[1m#x1B[31mE   AssertionError: assert [] == [{'anomaly': ... 0.047910238}]#x1B[0m
#x1B[1m#x1B[31mE     #x1B[0m
#x1B[1m#x1B[31mE     Right contains 2 more items, first extra item: {'anomaly': {'anomaly_score': -0.38810767243044786, 'anomaly_type': 'none'}, 'timestamp': 169, 'value': 0.048480431}#x1B[0m
#x1B[1m#x1B[31mE     #x1B[0m
#x1B[1m#x1B[31mE     Full diff:#x1B[0m
#x1B[1m#x1B[31mE     + []#x1B[0m
#x1B[1m#x1B[31mE     - [#x1B[0m
#x1B[1m#x1B[31mE     -     {#x1B[0m
#x1B[1m#x1B[31mE     -         'anomaly': {#x1B[0m
#x1B[1m#x1B[31mE     -             'anomaly_score': -0.38810767243044786,#x1B[0m
#x1B[1m#x1B[31mE     -             'anomaly_type': 'none',#x1B[0m
#x1B[1m#x1B[31mE     -         },#x1B[0m
#x1B[1m#x1B[31mE     -         'timestamp': 169,#x1B[0m
#x1B[1m#x1B[31mE     -         'value': 0.048480431,#x1B[0m
#x1B[1m#x1B[31mE     -     },#x1B[0m
#x1B[1m#x1B[31mE     -     {#x1B[0m
#x1B[1m#x1B[31mE     -         'anomaly': {#x1B[0m
#x1B[1m#x1B[31mE     -             'anomaly_score': -0.3890542800124323,#x1B[0m
#x1B[1m#x1B[31mE     -             'anomaly_type': 'none',#x1B[0m
#x1B[1m#x1B[31mE     -         },#x1B[0m
#x1B[1m#x1B[31mE     -         'timestamp': 170,#x1B[0m
#x1B[1m#x1B[31mE     -         'value': 0.047910238,#x1B[0m
#x1B[1m#x1B[31mE     -     },#x1B[0m
#x1B[1m#x1B[31mE     - ]#x1B[0m

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