fix(uptime): Pass uptime_rule tag as a string (#76213)

This is raising a validation error in the issue platform, just fixing.

Fixes SENTRY-3DEW

<!-- Describe your PR here. -->

Author: wedamija

src/sentry/uptime/issue_platform.py

@@ -98,7 +98,7 @@ def build_event_data_for_occurrence(
         "received": datetime.fromtimestamp(result["actual_check_time_ms"] / 1000),
         "sdk": None,
         "tags": {
-            "uptime_rule": project_subscription.id,
+            "uptime_rule": str(project_subscription.id),
         },
         "timestamp": occurrence.detection_time.isoformat(),
         "contexts": {"trace": {"trace_id": result["trace_id"], "span_id": None}},

tests/sentry/uptime/test_issue_platform.py

@@ -104,7 +104,7 @@ def test(self):
             "project_id": 1,
             "received": datetime.datetime.now().replace(microsecond=0),
             "sdk": None,
-            "tags": {"uptime_rule": project_subscription.id},
+            "tags": {"uptime_rule": str(project_subscription.id)},
             "timestamp": occurrence.detection_time.isoformat(),
             "contexts": {"trace": {"trace_id": result["trace_id"], "span_id": None}},
         }