Fix: Exclude deleted files from capital letter check

- Added --diff-filter=d to git diff command in test-lp.yml
- Prevents false positives when deleting files with capital letters
- Deleted files are now excluded from filename validation

Author: jaidev17

.github/workflows/test-lp.yml

@@ -31,7 +31,7 @@ jobs:
 
           tmpfile=$(mktemp)
 
-          git diff --name-only origin/${{ github.base_ref }}...HEAD |
+          git diff --name-only --diff-filter=d origin/${{ github.base_ref }}...HEAD |
             grep '^content/' |
             while read -r path; do
               name=$(basename "$path")