🔧 chore: make interaction type for messaging slos lowercase (#95454)

Author: iamrajjoshi

src/sentry/integrations/messaging/metrics.py

@@ -49,6 +49,9 @@ class MessagingInteractionType(StrEnum):
     SEND_ACTIVITY_NOTIFICATION = "SEND_ACTIVITY_NOTIFICATION"
     SEND_GENERIC_NOTIFICATION = "SEND_GENERIC_NOTIFICATION"
 
+    def __str__(self) -> str:
+        return self.value.lower()
+
 
 @dataclass
 class MessagingInteractionEvent(IntegrationEventLifecycleMetric):