Initialise nodeSelector/annotations in Pulsar-backed scheduler

[severinson]

Necessary for preemption to work.

┆Issue is synchronized with this Jira Task by Unito

[codecov]

Codecov Report

Patch coverage: 71.42% and project coverage change: -0.01 ⚠️

Comparison is base (df9ad30) 58.81% compared to head (30107e9) 58.81%.

❗ Current head 30107e9 differs from pull request most recent head 791956b. Consider uploading reports for the commit 791956b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2610      +/-   ##
==========================================
- Coverage   58.81%   58.81%   -0.01%     
==========================================
  Files         238      238              
  Lines       30542    30549       +7     
==========================================
+ Hits        17964    17968       +4     
- Misses      11209    11211       +2     
- Partials     1369     1370       +1     

Flag	Coverage Δ
armada-server	58.81% <71.42%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
internal/scheduler/preempting_queue_scheduler.go	65.44% <66.66%> (-0.22%)	⬇️
internal/scheduler/jobdb/job.go	78.41% <72.72%> (-0.29%)	⬇️

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