Use labels to prevent the benchmark runner from being triggered

[Wodann]

Definition of Done
It should be possible to disable the benchmark runner check based on labels.

Two possibilities are:

• detect whether one of a set of labels is specified to include/exclude runs ([fix, feature, perf] is an example of an inclusive set or [docs, ci, style] is an example of an exclusive set)
• add a no-benchmark-needed label to specifically indicate that benchmarks shouldn't be run, similar to the "no changeset needed" label