CI change, only run bench on performance label

[soulomoon]

We already have the performance label

[fendor]

CI looks like it skipped the benchmark job.

Do we want to run the benchmarks as nightly jobs perhaps? Ideally, there would be an easy way to access them later.

[soulomoon]

CI already skipped bench on some occasions.

And we almost never look at them unless we touch performance related code.

I think for now, if we touch performance related, manually adding the performance label should be enough.

But we can still add the nightly runs, if someone wants it.