Enhancement: reduce permissions on install script elastic-cloud-enterprise.sh

[jguay]

At the moment the installation script is owned by root in elastic home directory with execution permissions on any user

$ ls -l /home/elastic/
-rwxr-xr-x 1 root root 54962 Feb  7 22:55 elastic-cloud-enterprise.sh

This is not causing any issue especially as the home folder of user elastic is not accessible to users without sudo, but for the sake of it, it might be good to add owner and group with value elastic and possibly use something more restrictive than mode: 0755 in ece-bootstrap/main.yml