OZG-5238 Removed explicit Keycloak reference for dev

src/main/resources/application-dev.yaml

 ozgcloud:
-  production: false
-  oauth2:
-    auth-server-url: https://sso.dev.by.ozg-cloud.de
-    realm: by-kiel-dev
-    resource: admin
\ No newline at end of file
+  production: false
\ No newline at end of file