feat(metadata-core,rest,runtime,plugin-email,spec)!: the /meta doors carry no organization; organization-admin metadata authoring closes (ADR-0131 D6, #15206 S3)

feat(metadata-core,rest,runtime,plugin-email,spec)!: the /meta doors carry no organization; organization-admin metadata authoring closes (ADR-0131 D6, #15206 S3) #31912