Exclude compile-stub from metadata analysis (#15102)

Author: jaydeluca

instrumentation-docs/src/main/java/io/opentelemetry/instrumentation/docs/utils/FileManager.java

@@ -69,7 +69,7 @@ public static boolean isValidInstrumentationPath(String filePath) {
     }
 
     if (filePath.matches(
-        ".*(/test/|/testing|/build/|-common/|-common-|common-|-testing|bootstrap/src).*")) {
+        ".*(/test/|/testing|/build/|-common/|-common-|common-|/compile-stub/|-testing|bootstrap/src).*")) {
       return false;
     }