Allow multiple script keys in a job for gitlab-ci.yml

Motivation: Want to break my code multiple script templates for single job.

Example:

Templated version of proposal - This is want I wanted to do.

.template: &abc
  script_abc:
    - echo 'abc'

.template2: &xyz
  script_xyz:
    - echo 'xyz'

test:
  image: ubuntu
    <<: *abc
    <<: *xyz

Non-Templated version of proposal - This is want's required to be processed.

test:
  image: ubuntu
    script_abc:
      - echo 'abc'
    script_xyz:
      - echo 'xyz'

Output - Execution based on the order it was written

abc
xyz