Enable discovery of local schema registry running on default port 8081

[rohitsanj]

VSCode needs to be able to discover the local Schema Registry (SR) running on the default port 8081. However, the Schema Registry may not be available at the time of VSCode startup and could be added later during the session.

To address this, the GraphQL query responsible for discovering the local Kafka cluster should be updated to also check for the availability of the local Schema Registry. This will ensure that VSCode dynamically recognizes the SR when it becomes available.

{
  "query": "query localConnections {
    localConnections {
      id
      name
      type
      kafkaCluster {
        id
        name
        bootstrapServers
        uri
      }
      schemaRegistry {
        id
        uri
      }
    }
  }"
}