feat(execution): Add tests for JobConfigController, update JobReference fields

[irvinlim]

• Adds reconciler tests for JobConfigController.
• Update JobReference fields to remove namespace (all Jobs must be in the same namespace) and add creationTimestamp and startTime.

[codecov[bot]]

Codecov Report

Merging #58 (d571be6) into main (c828eea) will increase coverage by 2.90%. The diff coverage is 81.13%.

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   57.27%   60.17%   +2.90%     
==========================================
  Files         165      166       +1     
  Lines        8318     8369      +51     
==========================================
+ Hits         4764     5036     +272     
+ Misses       3321     3097     -224     
- Partials      233      236       +3     

Impacted Files	Coverage Δ
apis/execution/v1alpha1/jobconfig_types.go	100.00% <ø> (ø)
pkg/runtime/testing/action.go	72.41% <20.00%> (-10.92%)	:arrow_down:
...tion/controllers/jobconfigcontroller/controller.go	35.29% <70.00%> (+35.29%)	:arrow_up:
pkg/runtime/testing/reconciler.go	75.91% <71.42%> (-1.59%)	:arrow_down:
pkg/runtime/testing/recorder.go	88.88% <88.88%> (ø)
apis/execution/v1alpha1/zz_generated.deepcopy.go	58.69% <100.00%> (+3.46%)	:arrow_up:
...xecution/controllers/jobconfigcontroller/differ.go	100.00% <100.00%> (+100.00%)	:arrow_up:
...tion/controllers/jobconfigcontroller/reconciler.go	85.96% <100.00%> (+85.96%)	:arrow_up:
.../execution/controllers/jobconfigcontroller/util.go	100.00% <100.00%> (+100.00%)	:arrow_up:
pkg/utils/execution/jobconfig/job_utils.go	76.56% <100.00%> (ø)
... and 8 more

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