Respect node class for ratio calculations

[bastjan]

Summary

As role name
I want a feature or functionality
So that I get certain business value

Context

We now allow having plus and flex nodes on Cloudscale.

Those classes have different memory/cpu ratios. These ratios have to be taken into account in the billing queries.

https://github.com/appuio/appuio-cloud-reporting/blob/master/pkg/db/seeds/appuio_cloud_memory.promql#L47-L50

Out of Scope

No response

Further links

No response

Acceptance Criteria

• Queries are updated in the reporting database
• Facts are re-calculated if needed.

Implementation Ideas

No response