adding resource group.

When many pipelines run at the same time, could cause some collision, false results, or not passing tests.
Restructured CI to avoid this from happening.

.gitlab/test.yml

@@ -40,7 +40,8 @@ up-test-env-job:
 run-test-job:
   <<: *test-core
   before_script:
-    - pwd && ls && echo "${PROJ_DIR}--1" && echo "${PARENT_PROJECT_DIR}--2" && echo "$CI_PROJECT_DIR--3" && echo "$$PARENT_PROJECT_DIR--4" && echo "$$PROJ_DIR--5" && echo "$$CI_PROJECT_DIR--6"
+    - pwd && ls && echo "${PROJ_DIR}--1" && echo "${PARENT_PROJECT_DIR}--2" && echo "$CI_PROJECT_DIR--3"
+      && echo "$$PARENT_PROJECT_DIR--4" && echo "$$PROJ_DIR--5" && echo "$$CI_PROJECT_DIR--6"
 
     - python3 -m venv "${PROJ_DIR}/plugins/venv"
     - source "${PROJ_DIR}/plugins/venv/bin/activate"