ref(seer): Replace metrics.incr with logger.info for contributor seat tracking

The should_create increment in track_contributor_seat was emitting a
statsd metric. Switch to structured logging so the event is captured
in Sentry's log pipeline alongside the adjacent warning log calls.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: billyvg

src/sentry/seer/code_review/contributor_seats.py

@@ -24,7 +24,6 @@
 from sentry.models.repositorysettings import RepositorySettings
 from sentry.seer.autofix.constants import AutofixAutomationTuningSettings
 from sentry.tasks.organization_contributors import assign_seat_to_organization_contributor
-from sentry.utils import metrics
 
 logger = logging.getLogger(__name__)
 
@@ -121,10 +120,9 @@ def track_contributor_seat(
     if not should_increment_contributor_seat(organization, repo, contributor):
         return
 
-    metrics.incr(
+    logger.info(
         "scm.webhook.organization_contributor.should_create",
-        sample_rate=1.0,
-        tags={"provider": provider},
+        extra={"provider": provider},
     )
 
     locked_contributor = None