Enable MongoDB protocol dissector (#1903)

Add mongodb to the enabled dissectors list and port mapping (27017)
in both Go config defaults and Helm chart values.

Co-authored-by: Alon Girmonsky <alongir@Alons-Mac-Studio.local>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

helm-chart/values.yaml

@@ -205,6 +205,7 @@ tap:
   - http
   - icmp
   - kafka
+  - mongodb
   - redis
   - ws
   - ldap
@@ -224,6 +225,8 @@ tap:
     - 5672
     kafka:
     - 9092
+    mongodb:
+    - 27017
     redis:
     - 6379
     ldap: