Changes to Assign branding to a seller

api operation id branding.assignBrandingToSeller removed and replaced with branding#assignBrandingToSeller

api operation id branding#assignBrandingToSeller removed and replaced with branding.assignBrandingToSeller

api tag ops-branding added

removed the optional property is_white_label from the response with the 200 status

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

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

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