Instrumented tests run for infinite time

[rfc2822]

https://github.com/bitfireAT/cert4android/actions/runs/19496219855/job/55798961314

[rfc2822]

Doesn't seem to be fixed because this still takes many minutes (already ~ 7 min):

https://github.com/bitfireAT/cert4android/actions/runs/20692403294/job/59402365597

[sunkup]

Add timeout test rule max 10 sec for internet connecting tests.