Support array flattening when anchors/reference tags are used in dependencies keyword

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Summary

Anchor is working with needs but not with dependencies :

Steps to reproduce

  1. In a gitlab-ci file, define anchor with an array value
  2. use anchor with needs => ok
  3. use anchor with dependenies => ko, reason : Incorrect type. Expected "string".yaml-schema: https://gitlab.com/assets/webpack/ci.97c097a9.json(0)_
.needs_jobs: &needs_jobs
  - job-1
  - job-2

.dependencies_jobs: &dependencies_jobs
  - job-3
  - job-4

job:
  needs:
    - *needs_jobs
    - job-5
  dependencies:
    - *dependencies_jobs
    - job-6

Example Project

https://gitlab.com/gitlab-ci9281314/anchor-with-needs-and-dependencies/-/blob/main/.gitlab-ci.yml?ref_type=heads image

What is the current bug behavior?

dependencies don't accept anchor value

What is the expected correct behavior?

dependencies should accept anchor value since needs accept it

Results of GitLab application Check

Expand for output related to the GitLab application check 
This GitLab CI configuration is invalid: jobs:job config contains unknown keys: dependencies.
Edited by 🤖 GitLab Bot 🤖