feat: add serviceMonitor for metrics collector

[sumo-drosiek]

add serviceMonitor for metrics collector

Checklist

• Changelog updated or skip changelog label added
• Documentation updated
• Template tests added for new features
• Integration tests added or modified for major features

[swiatekm-sumo]

Can you re-add checking for these metrics in the integration test as well? Right now they're manually excluded.

[sumo-drosiek]

Can you re-add checking for these metrics in the integration test as well? Right now they're manually excluded.

I need to look at that, but it won't work until the environment variables won't be recognized correctly by target allocator. I may fix it in helm chart by using installation namespace instead of env variable