Configure OpenBao in CNG for E2E tests

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Why are we doing this work

E2E tests for the GitLab Secrets Manager need to be executed automatically on the CI. Since the feature is available on Cloud Native GitLab (CNG), these tests need to be executed as part of the e2e:test-on-cng pipeline.

Relevant links

• https://docs.gitlab.com/development/testing_guide/end_to_end/test_pipelines/#e2etest-on-cng)

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

Verification steps