Ignore JUnit report files in version control

Added `packages/**/*.junit.xml` to `.gitignore` to prevent JUnit report files from being tracked in the repository, keeping the working directory clean and avoiding unnecessary versioning of test artifacts.

Author: cod1k

.gitignore

@@ -61,3 +61,6 @@ packages/gatsby/gatsby-node.d.ts
 # intellij
 *.iml
 /**/.wrangler/*
+
+#junit reports
+packages/**/*.junit.xml