Test profiling uploading in CI

All flows we currently test are testing the profiling itself in local output.

However, we've had numerous breakages in the uploading logic - for example the breakage fixed [here](https://github.com/Granulate/gprofiler/pull/825) - so I'd like a basic sanity test that runs a short profiling session and uploads the results.

We will add a dummy token + service name as GH secret, then use them in the test.