fix(alerts): Fix flaky anomaly detection tests (#78218)

Follow up to #78186 to add
`freeze_time` and fix the flakiness.

tests/sentry/seer/anomaly_detection/test_store_data.py

@@ -1,5 +1,5 @@
 import logging
-from datetime import datetime
+from datetime import UTC, datetime, timedelta
 from typing import Any
 
 import pytest
@@ -10,7 +10,7 @@
 from sentry.snuba.dataset import Dataset
 from sentry.snuba.models import SnubaQuery
 from sentry.testutils.cases import BaseMetricsTestCase, PerformanceIssueTestCase
-from sentry.testutils.helpers.datetime import iso_format
+from sentry.testutils.helpers.datetime import before_now, freeze_time, iso_format
 from sentry.testutils.performance_issues.event_generators import get_event
 from sentry.utils.snuba import SnubaTSResult
 from tests.sentry.incidents.endpoints.test_organization_alert_rule_index import AlertRuleBase
@@ -30,15 +30,18 @@ def make_event(**kwargs: Any) -> dict[str, Any]:
     return result
 
 
+@freeze_time(before_now(days=2).replace(hour=0, minute=0, second=0, microsecond=0))
 class AnomalyDetectionStoreDataTest(AlertRuleBase, BaseMetricsTestCase, PerformanceIssueTestCase):
     def setUp(self):
         super().setUp()
-        self.time_1 = "2024-08-29T00:00:00Z"
-        self.time_1_dt = datetime(2024, 8, 29, 0, 0)
+
+        self.now = datetime.now(UTC)
+        self.time_1_dt = self.now - timedelta(days=2)
+        self.time_1 = self.time_1_dt.strftime("%Y-%m-%dT%H:%M:%SZ")
         self.time_1_ts = self.time_1_dt.timestamp()
 
-        self.time_2 = "2024-08-29T02:00:00Z"
-        self.time_2_dt = datetime(2024, 8, 29, 2, 0)
+        self.time_2_dt = self.now - timedelta(days=3)
+        self.time_2 = self.time_2_dt.strftime("%Y-%m-%dT%H:%M:%SZ")
         self.time_2_ts = self.time_2_dt.timestamp()
 
         self.received = self.time_1_ts
@@ -84,9 +87,6 @@ def test_anomaly_detection_format_historical_data_two(self):
         )
         assert result == expected_return_value
 
-    @pytest.mark.skip(
-        reason="This test is flaking, skipping for now - this feature isn't released."
-    )
     def test_anomaly_detection_fetch_historical_data(self):
         alert_rule = self.create_alert_rule(organization=self.organization, projects=[self.project])
         snuba_query = SnubaQuery.objects.get(id=alert_rule.snuba_query_id)
@@ -119,9 +119,6 @@ def test_anomaly_detection_fetch_historical_data(self):
         assert {"time": int(self.time_1_ts), "count": 1} in result.data.get("data")
         assert {"time": int(self.time_2_ts), "count": 1} in result.data.get("data")
 
-    @pytest.mark.skip(
-        reason="This test is flaking, skipping for now - this feature isn't released."
-    )
     def test_anomaly_detection_fetch_historical_data_is_unresolved_query(self):
         alert_rule = self.create_alert_rule(organization=self.organization, projects=[self.project])
         snuba_query = SnubaQuery.objects.get(id=alert_rule.snuba_query_id)
@@ -156,9 +153,6 @@ def test_anomaly_detection_fetch_historical_data_is_unresolved_query(self):
         assert {"time": int(self.time_1_ts), "count": 1} in result.data.get("data")
         assert {"time": int(self.time_2_ts), "count": 1} in result.data.get("data")
 
-    @pytest.mark.skip(
-        reason="This test is flaking, skipping for now - this feature isn't released."
-    )
     def test_anomaly_detection_fetch_historical_data_performance_alert(self):
         alert_rule = self.create_alert_rule(
             organization=self.organization, projects=[self.project], dataset=Dataset.Transactions
@@ -197,9 +191,6 @@ def test_anomaly_detection_format_historical_data_crash_rate_alert(self):
         result = format_historical_data(data, ["count()"], metrics_performance, self.organization)
         assert result == expected_return_value
 
-    @pytest.mark.skip(
-        reason="This test is flaking, skipping for now - this feature isn't released."
-    )
     def test_anomaly_detection_fetch_historical_data_crash_rate_alert(self):
         self.store_session(
             self.build_session(