feat: make more jobs interruptible for performance improvement

templates/lint/black.yml

 ---
 black:
+  interruptible: true
   before_script:
     - pip install tox
   stage: lint

templates/lint/check-manifest.yml

 ---
 check-manifest:
+  interruptible: true
   before_script:
     - pip install tox
   stage: lint

templates/lint/flake8.yml

 ---
 flake8:
+  interruptible: true
   before_script:
     - pip install tox flake8-gl-codeclimate
   stage: lint

templates/lint/mypy.yml

 ---
 mypy:
+  interruptible: true
   before_script:
     - pip install tox
   stage: lint

templates/lint/safety.yml

 ---
 safety:
+  interruptible: true
   stage: lint
   before_script:
     - pip install tox

templates/lint/yamllint.yml

 ---
 yamllint:
+  interruptible: true
   before_script:
     - pip install tox
   stage: lint

templates/tests/py27.yml

 ---
 py27:
+  interruptible: true
   before_script:
     - pip install tox
   stage: tests

templates/tests/py3.yml

 ---
 py3:
+  interruptible: true
   before_script:
     - pip install tox
   stage: tests