Add Oauth to test-on-cng pipeline

Tiffany Rearequested to merge
trea-add-oauth-to-test-on-cng into master

What does this MR do and why?

Add configuration for Github Oauth login scenario to test-on-cng/main.gitlab-ci.yml

This is part of Reduce pipeline runtime by moving orchestrated ... (gitlab-org/quality/quality-engineering&163)

Spec runs successfully here https://gitlab.com/gitlab-org/gitlab/-/jobs/12148223755

References

Related to gitlab-org/quality/quality-engineering/team-tasks#4030 (closed)

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Edited by Tiffany Rea

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