Ci include is not used in the root entry

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The include entry from Gitlab::Ci::Config::Entry::Root doesn't seem to be used during the validation step because it is removed when the YAML is expanded. Execution trace:

1. https://gitlab.com/gitlab-org/gitlab/-/blob/33a30ac369558476d77b92309b6c34613bc8752d/lib/gitlab/ci/config.rb#L25
2. https://gitlab.com/gitlab-org/gitlab/-/blob/33a30ac369558476d77b92309b6c34613bc8752d/lib/gitlab/ci/config.rb#L68
3. https://gitlab.com/gitlab-org/gitlab/-/blob/33a30ac369558476d77b92309b6c34613bc8752d/lib/gitlab/ci/config.rb#L81
4. https://gitlab.com/gitlab-org/gitlab/-/blob/33a30ac369558476d77b92309b6c34613bc8752d/lib/gitlab/ci/config/external/processor.rb#L25
5. https://gitlab.com/gitlab-org/gitlab/-/blob/33a30ac369558476d77b92309b6c34613bc8752d/lib/gitlab/ci/config/external/processor.rb#L47
6. https://gitlab.com/gitlab-org/gitlab/-/blob/33a30ac369558476d77b92309b6c34613bc8752d/lib/gitlab/ci/config.rb#L28

At the 6th step we validate the include entry, but it validates a nil value because the config was removed from the hash at step 5.

Should we remove include from the root entry config?