Enable PHPUnit job for auto_updates and package_manager unit tests only

Closes #3409774

.gitlab-ci.yml

@@ -58,15 +58,6 @@ variables:
   _PHPUNIT_TESTGROUPS: 'auto_updates,package_manager'
   _WEB_ROOT: '.'
 
-.setup-webserver: &setup-webserver
-  - mkdir -p $BROWSERTEST_OUTPUT_DIRECTORY
-  - mkdir -p $CI_PROJECT_DIR/$_WEB_ROOT/sites/default/files/simpletest
-  - chmod -R 755 $BROWSERTEST_OUTPUT_DIRECTORY
-  - chmod -R 755 $CI_PROJECT_DIR/$_WEB_ROOT/sites/default/files/simpletest
-  - ln -s $CI_PROJECT_DIR /var/www/html
-  - chown -R www-data:www-data $CI_PROJECT_DIR
-  - service apache2 start
-
 ###################################################################################
 #
 #                                        *
@@ -135,3 +126,8 @@ composer:
     - test -d ./core/modules/package_manager
     - test -d ./core/modules/auto_updates
     - rm -r -f ./modules/contrib
+
+phpunit:
+  extends: .phpunit-base
+  variables:
+    _WEB_ROOT: ''