chore: broaden scaffold test output gitignore (#59)

Add _scaffold*/ glob to cover _scaffold_output/ and any future
underscore-prefixed scaffold output directories. The existing output/
entry was too narrow and did not match the _scaffold_output/ name
produced by local scaffold test runs.

Signed-off-by: fOuttaMyPaint <154358121+TMHSDigital@users.noreply.github.com>

Author: TMHSDigital

.gitignore

@@ -43,4 +43,5 @@ Thumbs.db
 
 # Scaffold test output
 output/
+_scaffold*/
 /tmp/