Enable logging by default in CI and test it

Summary

We should enable and test our logging stack in CI.

For now, logging is only enabled in misc deployments, we should try to install it in more test scenarios, as long as there is enough room to host this stack. It is probably the case for metal3 deployments, but we may need to delay it a bit on capo as we have currently some resources constraints in CI (to be verified).

Additionally, we should also test that the logging stack is working as expected in CI. This should be fairly simple to implement once sylva-projects/sylva-elements/container-images/sylva-toolbox#12 (closed) will land, we'll be able to test that we're able to access loki API and fetch logs.