Adjust version trait

Do not inherit version trait to all pipelines.
Instead, only define on required pipeline level with link to correct
versionfile.

.ci/pipeline_definitions

@@ -1,7 +1,6 @@
 glci:
   base_definition:
     traits:
-      version: ~
       notifications:
         default:
           on_error:
@@ -57,6 +56,7 @@ glci:
         version:
           preprocess: 'finalize'
           inject_effective_version: True
+          versionfile: 'job-image-version'
         component_descriptor:
           component_name: 'github.com/gardenlinux/glci/utils'
           ocm_repository: europe-docker.pkg.dev/gardener-project/releases