[ci] Run lint job with pylint from the image

Disable E0401 (import-error) which checks for run time dependencies
not found outside of Poetry virtual environment

Move lint job to 'checks' stage since it's going faster without
dev dependencies installation

.gitlab-ci.yml

@@ -58,10 +58,9 @@ type:
 lint:
   extends:
     - .code_changes
-  stage: tests
+  stage: checks
   tags: [redshift]
   script:
-    - poetry install
     - make pylint
 
 .tests: