Python and Ruby tests depend on pyroscope.cloud

[kolesnikovae]

We're using pyroscope.cloud in tests:

• Python test: https://github.com/grafana/pyroscope-rs/blob/main/pyroscope_ffi/python/scripts/tests/test.py#L83
• Ruby test: https://github.com/grafana/pyroscope-rs/blob/main/pyroscope_ffi/ruby/scripts/tests/test.rb#L11

Given that the cloud is going to be decommissioned soon, we should get rid of the dependency

[korniltsev]

I've changed the python test to use localhost and a docker image here https://github.com/grafana/pyroscope-rs/pull/155

Did not touch ruby yet