Changes to [Beta] Update an McpConfig.

added the new optional request property auth_mechanism

added the new optional request property custom_headers

added the optional property custom_headers to the response with the 200 status

added the required property auth_mechanism to the response with the 200 status

the request property allowed_tools became not nullable

the request property description became not nullable

the request property endpoint became not nullable

the request property name became not nullable

endpoint added