Add support for lenient plugin and composer patches

includes/include.drupalci.main.yml

@@ -42,6 +42,14 @@
       echo -e "\e[0Ksection_end:`date +%s`:show_env_vars\r\e[0K"
     fi
 
+.add-composer-drupal-lenient: &add-composer-drupal-lenient
+  # Separately install and configure lenient plugin, if required.
+  - |
+    if [ "$LENIENT_ALLOW_LIST" != "0" ]; then 
+      composer global config --no-plugins allow-plugins.mglaman/composer-drupal-lenient true
+      composer global require mglaman/composer-drupal-lenient
+    fi
+
 .simpletest-db: &simpletest-db
   - |
     [[ $_TARGET_DB_TYPE == "sqlite" ]] && export SIMPLETEST_DB=sqlite://localhost/sites/default/files/db.sqlite
@@ -164,6 +172,7 @@ stages:
       - .
   script:
     - *show-environment-variables
+    - *add-composer-drupal-lenient
     # Expand the composer.json from the module with defaults to bring the Drupal project.
     - curl -OL https://git.drupalcode.org/$_GITLAB_TEMPLATES_REPO/-/raw/$_GITLAB_TEMPLATES_REF/scripts/expand_composer_json.php
     - php expand_composer_json.php
@@ -497,7+506,7 @@
     - *simpletest-db
     # Provide some context on the test run.
     - vendor/bin/drush status
     # Remove all spaces from _PHPUNIT_TESTGROUPS for reliable checking and to
     # ensure only one string is passed to bin/phpunit or run-tests.sh
     - _PHPUNIT_TESTGROUPS=$(echo $_PHPUNIT_TESTGROUPS | sed -e 's/ //g')
     # Execute tests.