ADDED: API for injecting arbitrary DRC errors/warn

Allows external tools to calculate/represent specialized DRC errors on
the board

Fixes https://gitlab.com/kicad/code/kicad/issues/21727

qa/tests/api/test_api_enums.cpp

@@ -30,6 +30,7 @@
 #include <font/text_attributes.h>
 #include <layer_ids.h>
 #include <stroke_params.h>
+#include <widgets/report_severity.h>
 
 // Board-specific
 #include <api/board/board_types.pb.h>
@@ -267,4 +268,9 @@ BOOST_AUTO_TEST_CASE( BoardStackupLayerType )
     testEnums<BOARD_STACKUP_ITEM_TYPE, kiapi::board::BoardStackupLayerType>();
 }
 
+BOOST_AUTO_TEST_CASE( DrcSeverity )
+{
+    testEnums<SEVERITY, kiapi::board::commands::DrcSeverity>( true );
+}
+
 BOOST_AUTO_TEST_SUITE_END()