Resolve #3394413 "Basic pipeline"

Closes #3394413

The goal here is to add a basic pipeline that doesn't run any tests, but builds successfully. The goal is to have a core clone with the Automatic Updates and Package Manager modules converted to core modules.

.gitlab-ci.yml

@@ -49,7 +49,6 @@ include:
 # Docs at https://git.drupalcode.org/project/gitlab_templates/-/blob/1.0.x/includes/include.drupalci.variables.yml
 ################
 variables:
-  SKIP_COMPOSER_LINT: '1'
   SKIP_ESLINT: '1'
   SKIP_PHPCS: '1'
   SKIP_PHPSTAN: '1'