Add license to tooling/lints crate (#60468)

Seeing `script/check-license` fail because we forgot to add a license in
#58496

> Error: tooling/lints does not contain a LICENSE-GPL or LICENSE-APACHE
symlink

Release Notes:

- N/A

.github/workflows/run_tests.yml

@@ -75,7 +75,7 @@ jobs:
           # Map directory names to package names
           FILE_CHANGED_PKGS=""
           for dir in $CHANGED_DIRS; do
-            pkg=$(echo "$DIR_TO_PKG" | grep "^${dir}=" | cut -d= -f2 | head -1)
+            pkg=$(echo "$DIR_TO_PKG" | grep "^${dir}=" | cut -d= -f2 | head -1 || true)
             if [ -n "$pkg" ]; then
               FILE_CHANGED_PKGS=$(printf '%s\n%s' "$FILE_CHANGED_PKGS" "$pkg")
             else