Add ability to kick off a Pages deploy from a job not named pages

Original Issue Title: pages:deploy not getting triggered when using hidden pages job

Hi Team, To support monorepo I am using include and extends directive in the root .gitlab-ci.yml file to further call the child .gitlab-ci.yml file. Below are the sample of root and child .gitlab-ci.yml files

Root .gilab-ci.yml file

stages:
  - test
  - pages
  - build

include:
  - local: 'license-service/.gitlab-ci.yml'

license-service-test:
  stage: test
  extends: .license-test

license-service-pages:
  stage: pages
  dependencies:
    - license-service-test
  extends: .license-pages

Child .gitlab-ci.yml file

.license-test:
  image: ${DOCKER_PROXY_HOST}/golang:${GO_VERSION}
  artifacts:
    paths:
      - ${CI_PROJECT_DIR}/license-service/build/tests/test-results.xml
    expire_in: 3d
  script:
    - gotestsum --junitfile build/tests/test-results.xml

.license-pages:
  extends: .license-template
  artifacts:
    paths:
      - public
  script:
    - mkdir .public
    - cp -r ${CI_PROJECT_DIR}/license-service/build/tests/test-results.xml .public
    - mv .public public

Both the jobs are executing successfully and I am also able to browse/download the artifacts, but this setup doesn't trigger the deploye:pages job which is required to push the content on gitlab pages. Am i doing something wrong.