CI: Remove pylint-yocto job

The job was used to check if all scripts are able to run in the yocto
CI image. Tim and Jonas decided to remove the job and plan to change
the CI, that the yocto image does not need to execute special python
scripts. That way we may use the plain crops/poky container for the
yocto build and remove this dependency thats hard to track.

BCS 746-000643

.gitlab-ci.yml

@@ -33,10 +33,6 @@ pylint:
   script:
     - pylint --rcfile=pylintrc *.py
 
-pylint-yocto:
-  extends: pylint
-  image: "${CI_IMAGE_YOCTO}"
-
 black:
   stage: analyze
   timeout: 2m