Frontend - Display validity check in MR security modal

What does this MR do and why?

Backend GraphQL added in: !197549 (merged)

Backend work to add findingTokenStatus to Pipeline Security Report and support MR pipelines added in: !197545 (closed)

This MR adds the frontend GraphQL for findingTokenStatus, and renders a token validity badge in the MR security modal details to display the computed status.

References

Screenshots or screen recordings

MR security modal:

Pipeline security tab:

How to set up and validate locally

MR acceptance checklist

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