feat(integrations): Send SLO lifecycle metrics to Sentry via SDK

Adds a direct sentry_sdk.metrics.count() call alongside the existing
metrics.incr() in record_event() so SLO metrics (started, success,
halted, failure) are sent to Sentry at 100% with integration_id,
bypassing the DualWrite experimental backend's 5% sample rate.

Author: trevor-e

src/sentry/integrations/utils/metrics.py

@@ -8,6 +8,7 @@
 from typing import Any, Self
 
 import sentry_sdk
+from django.conf import settings
 
 from sentry import options
 from sentry.exceptions import RestrictedIPAddress
@@ -167,6 +168,7 @@ def record_event(
 
         sample_rate = 1.0
         metrics.incr(key, tags=tags, sample_rate=sample_rate)
+        sentry_sdk.metrics.count(f"{settings.SENTRY_METRICS_PREFIX}{key}", 1, attributes=dict(tags))
 
         sentry_sdk.set_tags(tags)