`max_test_reject_rate`: set a maximum test rejection rate per test function

### Component

Forge

### Describe the feature you would like

I never found using `max_test_rejects` and `vm.assume` helpful, because changing the number of fuzz runs to a different value requires re-calibrating `max_test_rejects` to a sensible value. What's more is that this value will likely depend on the amount of tests you have that are making use of `vm.assume`.

It would be useful to be able to set a maximum reject rate that is applied per test function. Say, if I want the rejection rate to be a maximum of `10%`, then this should only apply to the rejection count of each function and not globally discard the whole fuzz campaign.

Perhaps adding this information as natspec could be useful (#4085).

Edit: I see the max test rejects actually apply per function already, still it would be great to specify this in a percentage.