feat(execution): Avoid using activeDeadlineSeconds to kill tasks

[irvinlim]

Closes #64. Also helps #63.

Avoids using activeDeadlineSeconds to kill tasks, instead it will use API deletion instead, which supports graceful termination.

[codecov]

Codecov Report

Merging #85 (d37f97c) into main (9e17087) will decrease coverage by 0.14%.
The diff coverage is 86.04%.

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   62.87%   62.72%   -0.15%     
==========================================
  Files         200      200              
  Lines       10434    10287     -147     
==========================================
- Hits         6560     6453     -107     
+ Misses       3517     3486      -31     
+ Partials      357      348       -9     

Impacted Files	Coverage Δ
apis/config/v1alpha1/dynamicconfig_types.go	100.00% <ø> (ø)
apis/config/v1alpha1/zz_generated.deepcopy.go	10.45% <0.00%> (+0.16%)	⬆️
apis/execution/v1alpha1/job_types.go	100.00% <ø> (ø)
...g/execution/taskexecutor/podtaskexecutor/labels.go	100.00% <ø> (ø)
.../execution/controllers/jobcontroller/reconciler.go	71.09% <83.05%> (+0.16%)	⬆️
...execution/taskexecutor/podtaskexecutor/pod_task.go	90.64% <100.00%> (+4.52%)	⬆️
pkg/execution/util/job/condition.go	95.52% <100.00%> (+0.28%)	⬆️
pkg/execution/util/job/phase.go	93.75% <100.00%> (ø)
pkg/execution/util/job/timeout.go	100.00% <100.00%> (ø)
pkg/utils/ktime/time.go	92.30% <100.00%> (+0.41%)	⬆️
... and 5 more

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