Issue #3507536: Switch to conditional usage of PHPStan for upstream incompatibilities

Closes #3507536

.gitlab-ci.yml

@@ -66,6 +66,17 @@ variables:
   OPT_IN_TEST_NEXT_MINOR: 1
   OPT_IN_TEST_MAX_PHP: 1
 
+  SKIP_COMPOSER_LINT: 1
+  SKIP_PHPCS: 1
+  SKIP_STYLELINT: 1
+  SKIP_ESLINT: 1
+  SKIP_CSPELL: 1
+  SKIP_PHPSTAN: 0
+  SKIP_NIGHTWATCH: 1
+  SKIP_PHPUNIT: 1
+  SKIP_TEST_ONLY_CHANGES: 1
+  SKIP_PAGES: 1
+
 # @todo Remove when https://www.drupal.org/project/gitlab_templates/issues/3452183 lands.
 .is-push-rule: &is-push-rule
   if: $CI_PIPELINE_SOURCE == "push" && $CI_PROJECT_ROOT_NAMESPACE == "project"