chore(api): fetch only the hitcount when checking existing resources...

...with same oid value

core/com.b2international.snowowl.core/src/com/b2international/snowowl/core/request/BaseTerminologyResourceUpdateRequest.java

@@ -80,6 +80,7 @@ private boolean updateOid(TransactionContext context, String oldOid, Builder upd
 
 		if (!oid.isBlank()) {
 			final boolean oidExist = ResourceRequests.prepareSearch()
+					.setLimit(0)
 					.filterByOid(oid)
 					.build()
 					.execute(context)