Add cost allocation dashboard grafonnet equivalent

[GeorgianaElena]

Fixes #4875

Only first two panels are ready. I've deployed them into the openscapes grafana under a testing new directory.

[GeorgianaElena]

I give up!

The last panel that's supposed to present the costs per component and per hub doesn't work unfortunately.

And this is because I cannot find a way to specify the a variable of type Query and of subtype Infinity so i can pass it on the URL and all the other fields.

I couldn't get it to work with a custom variable either. API docs of vars is at https://grafana.github.io/grafonnet/API/dashboard/variable.html.

I will merge this PR as it is, so we can get the automation of deploying it ready as well and I will open a spike about figuring out is an infinity value is not available and what to do if it isn't and we can tackle this separately.

Btw, locally, I deployed this with the command below, ran from the jupyterhub/grafana-dashboards.

/deploy.py --dashboards-dir /Users/georgiana/dev/2i2c/pilot-hubs/grafana-dashboards --folder-name testing --folder-uid aws-ce-grafana-backend https://grafana.openscapes.2i2c.cloud

[GeorgianaElena]

cc @consideRatio, if you want to fiddle with this more. I will open a separate spike for you to assign if you wish.

[GeorgianaElena]

I opened #4944