[FIX] web: ensure realpath is installed

With this commit, if realpath is not available (for exemple on macos),
the script is directly stopped.

closes odoo/odoo#90522

X-original-commit: 7857c577948d55842a5697ca6d91bb6ea656ef6e
Signed-off-by: Samuel Degueldre <sad@odoo.com>
Signed-off-by: Pierre Rousseau (pro) <pro@odoo.com>

addons/web/tooling/enable.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 community=$(cd -- "$(dirname "$0")" &> /dev/null && cd ../../.. && pwd)
 tooling="$community/addons/web/tooling"
+testRealPath="$(realpath --relative-to=. "$tooling/hooks")"
+if [[ $testRealPath == "" ]]; then
+    echo "Please install realpath"
+    exit 1
+fi
 
 enableInDir () {
     cd $1