Add abiility to run `Quick` and `Slow` benchmarks

[gs0510]

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Some benchmarks might run faster than others and it might be useful for the pipeline to report the Quick benchmarks and report that and run Slow benchmarks in the background as well.

[MagnusS]

This may be easier to implement in the UI when we get support for the github checks API in ocurrent. This is planned, but work has not started yet. This could allow us to e.g. run quick benchmarks by default on PRs to make it faster to iterate, then have a button on the github PR that enables a slower version (which could also optionally be required for merging).