exclude parse kotlin files under path protos/build/generated (#237)

Author: kunli2

plugin/src/main/java/org/openrewrite/gradle/isolated/DefaultProjectParser.java

@@ -739,7 +739,9 @@ public Stream<SourceFile> parse(Project subproject, Set<Path> alreadyParsed, Exe
                 }
 
                 if (subproject.getPlugins().hasPlugin("org.jetbrains.kotlin.jvm")) {
+                    String excludedProtosPath = subproject.getProjectDir().getPath() + "/protos/build/generated";
                     List<Path> kotlinPaths = unparsedSources.stream()
+                            .filter(it -> !it.toString().startsWith(excludedProtosPath))
                             .filter(it -> it.toString().endsWith(".kt"))
                             .collect(toList());