Add `is-unsafe-link` to performance bar download button
What does this MR do and why?
With !116602 (closed) we changed all a calls to gl-link, one of those a had a blob download of all the perforamnce data. With gl-link we should set is-unsafe-link if trying to [link to a location considered unsafe by the SafeLink directive](https://design.gitlab.com/components/link/code). So in this MR I set is-unsafe-link` to be able to download performance bar data on the performance bar again.
How to set up and validate locally
- Click the Download button on the Performance bar
MR acceptance checklist
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Edited by Roy Zwambag