Move 2 verify E2E specs to EE due to using premium feature

What does this MR do and why?

Moving parent_child_pipelines_dependent_relationship_spec and multi-project_pipelines_spec.rb under ee folder because both tests use needs:project which is a premium feature.

More detailed information in https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1329#note_959556056 and similar errors in Nightly #360355 (closed)

Screenshots or screen recordings

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If running against CE or EE with no license, child_job fails with This job could not start because it could not retrieve the needed artifacts.

screenshot

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Prepare GitLab instance with license
2. Run parent_child_pipelines_dependent_relationship_spec or multi-project_pipelines_spec.rb against it

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.