[Generator Diff] Ignore file we are not interested in. (#11409)

tools/compare-commits.sh

@@ -224,6 +224,7 @@ find "$OUTPUT_DIR/build" "$OUTPUT_DIR/build-new" '(' \
 	-name 'Constants.cs' -or \
 	-name 'generator.csproj*' -or \
 	-name 'bgen.csproj.*' -or \
+	-name 'bgen.runtimeconfig.dev.json' -or \
 	-name 'PublishOutputs.*.txt' -or \
 	-name '*.cache' \
 	')' -delete