[Search] Fix autogenerated connector names (#197585)

Improve the autogenerated connector names by

- Re-generating names when changing connector source
- Preventing editing of names after connector is created

(cherry picked from commit c05e1c5)

Author: navarone-feekery

x-pack/plugins/enterprise_search/public/applications/enterprise_search_content/components/connectors/create_connector/start_step.tsx

@@ -106,6 +106,7 @@ export const StartStep: React.FC<StartStepProps> = ({
                     name="first"
                     value={rawName}
                     onChange={handleNameChange}
+                    disabled={!!connector}
                     onBlur={() => {
                       if (selectedConnector) {
                         generateConnectorName({

x-pack/plugins/enterprise_search/public/applications/enterprise_search_content/components/new_index/method_connector/new_connector_logic.ts

@@ -143,9 +143,7 @@ export const NewConnectorLogic = kea<MakeLogicType<NewConnectorValues, NewConnec
       }
     },
     connectorNameGenerated: ({ connectorName }) => {
-      if (!values.rawName) {
-        actions.setRawName(connectorName);
-      }
+      actions.setRawName(connectorName);
     },
     createConnector: ({
       isSelfManaged,
@@ -191,7 +189,6 @@ export const NewConnectorLogic = kea<MakeLogicType<NewConnectorValues, NewConnec
     setSelectedConnector: ({ connector }) => {
       if (connector) {
         actions.generateConnectorName({
-          connectorName: values.rawName,
           connectorType: connector.serviceType,
         });
       }