Handle unschedulable nodes in the scheduler

[severinson]

┆Issue is synchronized with this Jira Task by Unito

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.04 ⚠️

Comparison is base (0fd3091) 58.49% compared to head (26216a2) 58.45%.

❗ Current head 26216a2 differs from pull request most recent head a5986b4. Consider uploading reports for the commit a5986b4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2449      +/-   ##
==========================================
- Coverage   58.49%   58.45%   -0.04%     
==========================================
  Files         234      235       +1     
  Lines       29296    29316      +20     
==========================================
  Hits        17136    17136              
- Misses      10844    10862      +18     
- Partials     1316     1318       +2     

Flag	Coverage Δ
armada-server	58.45% <0.00%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
internal/scheduler/nodedb/nodedb.go	58.77% <0.00%> (-0.30%)	⬇️
internal/scheduler/nodedb/unschedulable.go	0.00% <0.00%> (ø)
internal/scheduler/preempting_queue_scheduler.go	64.37% <0.00%> (-0.32%)	⬇️
internal/scheduler/schedulerobjects/node.go	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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