ci: Update CI image to bullseye and use fsmpi registry

.gitlab-ci.yml

 ---
 
-image: registry.git.stud.rwth-aachen.de/infra/ci-containers/asta-ansible:buster
+image: registry.git.fsmpi.rwth-aachen.de/infra/ci-containers/fsmpi-ansible:bullseye
 
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
@@ -20,5 +20,4 @@ test:
   script:
     - yamllint .
     - ansible-lint ./*/
-    # yamllint disable-line rule:line-length
     - "! rg --fixed-strings 'passwordstore' ./*/templates"