Fire upgrade if extension is already registered

[stevenrombauts]

Consider the following scenario:

• Website is being deployed using a tool such as Capistrano
• The database already has the extension schema applied and is registered in assets/extensions tables
• A new deployment triggers composer install, which will try to re-install those extensions
• Errors will be thrown because the extension schema is already applied

To solve this :

• After downloading of the files by Composer, check if the extension is already installed yes or no by looking at the database
• If not installed, run install(), otherwise run update()

[stevenrombauts]

The JInstallerAdapterComponent::update() method fails when trying to update if the extensions' code is missing because it tries to look for the old manifest. See: https://github.com/joomlatools/joomlatools-platform/blob/f821f3fb87d7101670bb309f17a43ac127ead5f1/lib/libraries/cms/installer/adapter/component.php#L632-L650

This needs to be fixed in platform first.

[johanjanssens]

@stevenrombauts You need any help on this in the platform ?