Changes to POST /v1/:name:cancel

removed the request body

removed the media type */* for the response with the status 200

api operation id vmmigration.projects.locations.operations.cancel removed and replaced with vmmigration.projects.locations.sources.migratingVms.cutoverJobs.cancel

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

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

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

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

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