Display verification token on streaming audit event destination screen

Release notes

Problem to solve

Users today use the verificationToken value in our API to confirm that the audit events being sent from GitLab are valid and not from an alternate source impersonating GitLab. However, this value is only available through the API. If a user wants to use the UI, they can't see this token and must rely on the API. This introduces an extra step and reduces the value of the UI.

Proposal

Add the verification token to the streaming audit events UI.

Design

Attached designs are the end-vision, the below design is for this issue

Implementation plan

frontend - 2️⃣

• Add verificationToken to retrieval GraphQL query
• Add a <code></code> block with the verification token and tooltip to the stream item
  • Make sure the code block has a tab index for keyboard users
• Update specs
• Update https://docs.gitlab.com/ee/administration/audit_event_streaming.html#verify-event-authenticity to note that you can find the verificationToken via the UI

Intended users

• Cameron (Compliance Manager)

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