Actions: Add successfully extracted files query

Author: henrymercer

actions/ql/src/Diagnostics/SuccessfullyExtractedFiles.ql

@@ -0,0 +1,13 @@
+/**
+ * @id actions/diagnostics/successfully-extracted-files
+ * @name Extracted files
+ * @description List all files that were extracted.
+ * @kind diagnostic
+ * @tags successfully-extracted-files
+ */
+
+private import codeql.Locations
+
+from File f
+where exists(f.getRelativePath())
+select f, ""