[ws-scheduler] Respect pod slots when scheduling

[csweichel]

This PR makes ws-scheduler respect the pod slots available on a node.

fixes #4700

[codecov]

Codecov Report

Merging #4744 (5549736) into main (8f0c24a) will increase coverage by 13.87%.
The diff coverage is 95.23%.

@@             Coverage Diff             @@
##             main    #4744       +/-   ##
===========================================
+ Coverage   48.80%   62.68%   +13.87%     
===========================================
  Files          30        9       -21     
  Lines        6661     1790     -4871     
===========================================
- Hits         3251     1122     -2129     
+ Misses       3163      597     -2566     
+ Partials      247       71      -176     

Flag	Coverage Δ
components-ee-ws-scheduler-app	62.68% <95.23%> (+0.48%)	⬆️
components-local-app-app-darwin	?
components-local-app-app-linux	?
components-local-app-app-windows	?
components-ws-manager-app	?
components-ws-proxy-app	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...mponents/ee/ws-scheduler/pkg/scheduler/strategy.go	58.69% <94.11%> (+2.88%)	⬆️
components/ee/ws-scheduler/pkg/scheduler/state.go	90.46% <100.00%> (+0.09%)	⬆️
components/ws-manager/pkg/manager/manager_ee.go
components/ws-manager/pkg/manager/create.go
...s/ws-manager/pkg/manager/internal/grpcpool/pool.go
...omponents/ws-manager/pkg/manager/pod_controller.go
components/ws-proxy/pkg/proxy/workspacerouter.go
components/ws-proxy/pkg/proxy/infoprovider.go
components/ws-proxy/pkg/proxy/config.go
... and 15 more

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[geropl]

Code looks good, unit tests run: ✔️