Remove duplicate php-fpm container

[kierenevans]

Fixes #761

services.php-fpm.enabled is true for helm chart purposes since #609, so will be included as part of the main application.yml.twig loop over enabled services.

A few alternatives:

1. Set enabled to false in services for docker and true in helm for pipeline.base.services (potential breaking change?)
2. Add an if statement in the application.yml.twig to skip over php-fpm.

[andytson-inviqa]

or 3. set a variable in webapp.yml which is checked to conditionally render php/nginx if webapp service is enabled and the variable is set

[andytson-inviqa]

I'll try a PR with that to compare

[andytson-inviqa]

went with #765 instead