[MATRIX-1193] Add username/password to tests

Author: AitorAlgorta

test/fixtures/output/flink/connection/create-help.golden

@@ -18,8 +18,8 @@ Flags:
       --aws-secret-key string      Specify secret key for the type: "bedrock" or "sagemaker".
       --aws-session-token string   Specify session token for the type: "bedrock" or "sagemaker".
       --service-key string         Specify service key for the type: "vertexai".
-      --username string            Specify username for the type: "mongodb", "couchbase", "confluent_jdbc", or "rest".
-      --password string            Specify password for the type: "mongodb", "couchbase", "confluent_jdbc", or "rest".
+      --username string            Specify username for the type: "mongodb", "elastic", "couchbase", "confluent_jdbc", or "rest".
+      --password string            Specify password for the type: "mongodb", "elastic", "couchbase", "confluent_jdbc", or "rest".
       --token string               Specify bearer token for the type: "rest" or "mcp_server".
       --token-endpoint string      Specify OAuth2 token endpoint for the type: "rest" or "mcp_server".
       --client-id string           Specify OAuth2 client ID for the type: "rest" or "mcp_server".

test/fixtures/output/flink/connection/update-help.golden

@@ -16,8 +16,8 @@ Flags:
       --aws-secret-key string      Specify secret key for the type: "bedrock" or "sagemaker".
       --aws-session-token string   Specify session token for the type: "bedrock" or "sagemaker".
       --service-key string         Specify service key for the type: "vertexai".
-      --username string            Specify username for the type: "mongodb", "couchbase", "confluent_jdbc", or "rest".
-      --password string            Specify password for the type: "mongodb", "couchbase", "confluent_jdbc", or "rest".
+      --username string            Specify username for the type: "mongodb", "elastic", "couchbase", "confluent_jdbc", or "rest".
+      --password string            Specify password for the type: "mongodb", "elastic", "couchbase", "confluent_jdbc", or "rest".
       --token string               Specify bearer token for the type: "rest" or "mcp_server".
       --token-endpoint string      Specify OAuth2 token endpoint for the type: "rest" or "mcp_server".
       --client-id string           Specify OAuth2 client ID for the type: "rest" or "mcp_server".