fix(crons): Remvove incorrect CHECKIN_ID from checkins endpoints (#63704)

Breaking out from #62917

Fixes #62717

Author: evanpurkhiser

src/sentry/monitors/endpoints/organization_monitor_checkin_index.py

@@ -37,7 +37,6 @@ class OrganizationMonitorCheckInIndexEndpoint(MonitorEndpoint):
         parameters=[
             GlobalParams.ORG_SLUG,
             MonitorParams.MONITOR_SLUG,
-            MonitorParams.CHECKIN_ID,
         ],
         responses={
             200: inline_sentry_response_serializer(