fix(api): case insensitive sort for datasources

The data source list is case sensitive when sorted. This changes the
sort to be case insensitive. The test only tests the handler, not the
routing or database query.

pkg/api/dtos/models.go

@@ -91,7 +91,7 @@ func (slice DataSourceList) Len() int {
 }
 
 func (slice DataSourceList) Less(i, j int) bool {
-	return slice[i].Name < slice[j].Name
+	return strings.ToLower(slice[i].Name) < strings.ToLower(slice[j].Name)
 }
 
 func (slice DataSourceList) Swap(i, j int) {