Ignore agents that are not sufficient for pending workload

[xoxys]

If static agents with free capacities exist, but the agents cannot process pending workload due to their configuration, e.g. due to labels, the autoscaler still does not create any agents.

[xoxys]

Checked again, this setup definitely causes problems.

[pat-s]

Can confirm, had a static agent with workloads for amd64 and the autoscaler with a filter for arm64. The latter only kicked in once the static agent was removed.

[anbraten]

From #172:

e.g. don't count an running x86 agent arm64 etc ...

It would be nice if the autoscaler could scale up even if there is already an agent running but the current agent does not match labels in the queue but the autoscaler passed labels to create an agent would match ...