Tidy up .gitlab-ci.yml

* Remove unused variables
* Remove temporary job overwrites
* Remove stuff which moved to included yaml file
8 jobs for develop in 7 minutes and 24 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Maintenance
manual #24680
allowed to fail manual
Get dump for local environment
 
  Test
passed #24683
test:composer

00:01:47

passed #24682
test:php

00:01:47

passed #24681
test:typoscript

00:01:52

 
  Build
passed #24684
build

00:01:31

 
  Layout
passed #24685
layout

00:01:47

 
  Deploy
passed #24686
deploy-develop

00:01:37

 
  Badges
passed #24687
Create Badge

00:00:35