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 Name Job ID Coverage
  Maintenance
manual Get dump for local environment #24680
allowed to fail manual
 
  Test
passed test:composer #24683

00:01:47

passed test:php #24682

00:01:47

passed test:typoscript #24681

00:01:52

 
  Build
passed build #24684

00:01:31

 
  Layout
passed layout #24685

00:01:47

 
  Deploy
passed deploy-develop #24686

00:01:37

 
  Badges
passed Create Badge #24687

00:00:35