Quarantine flaky GitHub OAuth spec

Adil Farrukhrequested to merge
duo-edit-20251204-161650 into master

This MR quarantines the flaky GitHub OAuth login test to prevent it from causing pipeline failures.

The test oauth_login_with_github_spec.rb has been marked with the :quarantine tag.

Relates to https://gitlab.com/gitlab-org/quality/test-failure-issues/-/work_items/17856

Edited by Adil Farrukh

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