Changes to GET /v3/serp/yahoo/organic/tasks_fixed

api operation id SerpYahooOrganicTasksFixed removed and replaced with YahooOrganicTasksFixed

api operation id YahooOrganicTasksFixed removed and replaced with SerpYahooOrganicTasksFixed

removed the optional property oneOf[#/components/schemas/SerpYahooOrganicTasksFixedResponseInfo]/allOf[subschema #2]/tasks/items/oneOf[#/components/schemas/SerpYahooOrganicTasksFixedTaskInfo]/allOf[subschema #2]/result/items/oneOf[#/components/schemas/SerpYahooOrganicTasksFixedResultInfo]/date_fixed from the response with the 200 status

added the optional property oneOf[#/components/schemas/SerpYahooOrganicTasksFixedResponseInfo]/allOf[subschema #2]/tasks/items/oneOf[#/components/schemas/SerpYahooOrganicTasksFixedTaskInfo]/allOf[subschema #2]/result/items/oneOf[#/components/schemas/SerpYahooOrganicTasksFixedResultInfo]/date_posted to the response with the 200 status