Changes to GET /v3/serp/youtube/video_info/tasks_fixed

api operation id SerpYoutubeVideoInfoTasksFixed removed and replaced with YoutubeVideoInfoTasksFixed

api operation id YoutubeVideoInfoTasksFixed removed and replaced with SerpYoutubeVideoInfoTasksFixed

removed the optional property oneOf[#/components/schemas/SerpYoutubeVideoInfoTasksFixedResponseInfo]/allOf[subschema #2]/tasks/items/oneOf[#/components/schemas/SerpYoutubeVideoInfoTasksFixedTaskInfo]/allOf[subschema #2]/result/items/oneOf[#/components/schemas/SerpYoutubeVideoInfoTasksFixedResultInfo]/date_fixed from the response with the 200 status

added the optional property oneOf[#/components/schemas/SerpYoutubeVideoInfoTasksFixedResponseInfo]/allOf[subschema #2]/tasks/items/oneOf[#/components/schemas/SerpYoutubeVideoInfoTasksFixedTaskInfo]/allOf[subschema #2]/result/items/oneOf[#/components/schemas/SerpYoutubeVideoInfoTasksFixedResultInfo]/date_posted to the response with the 200 status