update black, isort and pytest .yml

templates/python/code_quality/black/black.yml

@@ -2,11 +2,10 @@ include:
   - remote: 'https://api.r2devops.io/job/r/gitlab/dorianturba/r2devops_catalog/r2_metadata/python_install@latest.yaml'
 
 black:
-    image: python:${IMAGE_TAG}
+    extends:
+        - .python_install
     stage: code_quality
     variables:
-        IMAGE_TAG: !reference [.python_install, variables, IMAGE_TAG]
-        PROJECT_PATH: "."
         PYTHON_SETUP: "pip install black"
     script:
         - !reference [.python_install, script]

templates/python/code_quality/isort/isort.yml

@@ -2,11 +2,10 @@ include:
   - remote: 'https://api.r2devops.io/job/r/gitlab/dorianturba/r2devops_catalog/r2_metadata/python_install@latest.yaml'
 
 isort:
-    image: python:${IMAGE_TAG}
+    extends:
+        - .python_install
     stage: code_quality
     variables:
-        IMAGE_TAG: !reference [.python_install, variables, IMAGE_TAG]
-        PROJECT_PATH: "."
         PYTHON_SETUP: "pip install isort"
     script:
         - !reference [.python_install, script]

templates/python/testing/pytest/pytest.yml

@@ -2,11 +2,10 @@ include:
   - remote: 'https://api.r2devops.io/job/r/gitlab/dorianturba/r2devops_catalog/r2_metadata/python_install@latest.yaml'
 
 pytest:
-    image: python:${IMAGE_TAG}
+    extends:
+        - .python_install
     stage: test
     variables:
-        IMAGE_TAG: !reference [.python_install, variables, IMAGE_TAG]
-        PROJECT_PATH: "."
         PYTHON_SETUP: "pip install -r ${PROJECT_PATH}/requirements.txt"
         PYTEST_RUN_CMD: "pytest ${PROJECT_PATH}"
     script: