removed static_headers property of experiment_type schema in order to only use static_headers mixin
removed static_headers property of experiment_type schema in order to only use static_headers mixin

4dn-dcic/fourfront,4dn-dcic/fourfront,hms-dbmi/fourfront,hms-dbmi/fourfront,4dn-dcic/fourfront,hms-dbmi/fourfront,hms-dbmi/fourfront,hms-dbmi/fourfront,4dn-dcic/fourfront