fix(execution): Handle IndependentReconciler bugs in JobQueueController, add tests

[irvinlim]

Fixes #17 and #55.

[codecov]

Codecov Report

Merging #56 (62a663c) into main (3e131b7) will increase coverage by 2.23%.
The diff coverage is 85.45%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   54.71%   56.94%   +2.23%     
==========================================
  Files         163      164       +1     
  Lines        8133     8174      +41     
==========================================
+ Hits         4450     4655     +205     
+ Misses       3477     3295     -182     
- Partials      206      224      +18     

Impacted Files	Coverage Δ
...ution/controllers/jobqueuecontroller/controller.go	27.63% <70.58%> (+27.63%)	⬆️
...g/runtime/controllercontext/mock/context_stores.go	75.00% <75.00%> (ø)
...xecution/controllers/jobqueuecontroller/control.go	48.64% <100.00%> (+48.64%)	⬆️
...llers/jobqueuecontroller/reconciler_independent.go	80.88% <100.00%> (+80.88%)	⬆️
pkg/runtime/controllercontext/mock/context.go	81.25% <100.00%> (+8.83%)	⬆️
...kg/execution/controllers/croncontroller/metrics.go	14.28% <0.00%> (-85.72%)	⬇️
pkg/runtime/reconciler/metrics.go	42.10% <0.00%> (-26.32%)	⬇️
pkg/utils/ktime/time.go	91.89% <0.00%> (+5.40%)	⬆️
... and 8 more

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