Unique scripts dir per service

[AaronFeledy]

Since recipes define their own plugin version dependencies, it's possible to run multiple versions of this plugin in a single app. Each version might depend on its own versions of the scripts it provides. Currently, only one version of the scripts can exist at a time, which can cause issues when the script doesn't match the builder that uses it.

This PR modifies the builder so that it creates a unique path for the service's scripts and copies its own version of the scripts there. e.g. ~/.lando/apps/myapp-fe49e234fdbb10b33c9eff64e431e7197089ff08/service-php-appserver/scripts

The unique directory is mounted in the service at /opt/lando-service/scripts.

The install-composer.sh script is now called from this new mount rather than /helpers.

An app.js is added with a post-destroy hook to clean up the new service directory.

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