[DPE-5611] Remove cruise-control metrics reporter if no balancer

[Batalex]

Changes:

• Set package mode to false in pyproject.toml. This will prevent poetry from emitting a warning every time we use the install subcommand
• The properties related to Cruise Control are now set only if we run the balancer workload in the application or if we use the peer-cluster relation. This will prevent the broker from spamming the logs with warnings in simple deployments

I'll keep this PR as a draft until #244 is merged, as we'll need to update the relation name in the condition

[deusebio]

Looks good! Seems pretty straightforward!