Ensure ERC Exclusions are maintained

After we load/resolve the exclusions, we want to ensure that the
resolved ones are re-recorded into the project file so that it always
remains consistent with the state of the system.  This way, if pcbnew
closes first and re-saves the project, our exclusions are not lost until
the schematic closes

Fixes https://gitlab.com/kicad/code/kicad/-/issues/21410

eeschema/schematic.cpp

@@ -906,6 +906,10 @@ void SCHEMATIC::ResolveERCExclusionsPostUpdate()
         else
             RootScreen()->Append( marker );
     }
+
+    // Once we have the ERC Exclusions, record them in the project file so that
+    // they are retained even before the schematic is saved (PCB Editor can also save the project)
+    RecordERCExclusions();
 }