Make install and activation of plugins optional

[bugsysop]

Describe the bug

At every update this app re-install and activate three plugins (wp-fail2ban-redux, companion-auto-update, authldap) without information to the YNH user/admin, and without request of consent.

This is a security concern and an ethical issue.

Context

• Hardware: All
• YunoHost version: Latest
• I have access to my server: *Through SSH | through the webadmi
• Are you in a special context or did you perform some particular tweaking on your YunoHost instance?: no!
• Using, or trying to install package version/branch: Stable
• If upgrading, current package version: Latest

Steps to reproduce

```sh
sudo yunohost app update wordpress
```

Expected behavior

1. Inform clearly the user/admin before running the upgrade.
2. Request of an explicit consent to proceed.