keycloak network policy for smtp egress and custom plugin code

Package Owner Merge Request

Package Changes

• adds keycloak network policy for smtp egress
• custom plugin code changes

Package MRs
https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/37
https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/36
https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/merge_requests/35

Package Tag
https://repo1.dso.mil/platform-one/big-bang/apps/security-tools/keycloak/-/tags/11.0.1-bb.6

Closes #781 (closed)