Cannot use optional with child pipeline needs

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Summary

When using child pipelines its not possible to use optional for needs referenced from the parent using pipeline

Steps to reproduce

1. trigger a child pipeline with reference to the parent:

job:
  variables:
    - PARENT_PIPELINE_ID: $CI_PIPELINE_ID
  trigger:
    include:
      file: 'another-file.yml'

2. child has a job with a needs

job:
  needs:
    - pipeline: $PARENT_PIPELINE_ID
      job: build
      optional: true

3. fails because of the ci linter

Example Project

What is the current bug behavior?

A pipeline with this config results in a CI lint error:

Found errors in your .gitlab-ci.yml:
jobs:plan:needs:need config contains unknown keys: optional
You can also test your .gitlab-ci.yml in CI Lint

What is the expected correct behavior?

Its always possible to use optional for job needs.

Output of checks

This bug happens on GitLab.com

Related

#30680 (comment 617788334) #30680 (comment 646498954)