setupvars.sh: ignore cd output (#20657)

* `setupvars.sh`: ignore `cd` output

Having `function cd() { builtin cd "$@" && l; }` defined in bash breaks `setupvars.sh`

* Use `builtin cd` to enable `function cd() { builtin cd "$@" && l; }`, remove wrapping `echo $()` because `pwd` already prints

scripts/setupvars/setupvars.sh

@@ -6,7 +6,8 @@
 abs_path () {
     script_path=$(eval echo "$1")
     directory=$(dirname "$script_path")
-    echo "$(cd "$directory" || exit; pwd -P)";
+    builtin cd "$directory" || exit
+    pwd -P
 }
 
 SCRIPT_DIR="$(abs_path "${BASH_SOURCE[0]}")" >/dev/null 2>&1