feat(execution): Change maxRetryAttempts to maxAttempts

[irvinlim]

Closes #45.

• Updates all references of maxRetryAttempts to maxAttempts.
• All logic interfacing with field are updated to count the first task as the first attempt.

[codecov]

Codecov Report

Merging #48 (acdf89c) into main (e24be62) will increase coverage by 0.22%.
The diff coverage is 92.45%.

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   54.47%   54.69%   +0.22%     
==========================================
  Files         163      163              
  Lines        8097     8128      +31     
==========================================
+ Hits         4411     4446      +35     
+ Misses       3478     3474       -4     
  Partials      208      208              

Impacted Files	Coverage Δ
apis/execution/v1alpha1/job_types.go	100.00% <ø> (ø)
.../execution/controllers/jobcontroller/reconciler.go	75.15% <ø> (ø)
pkg/execution/validation/corev1.go	77.77% <0.00%> (ø)
pkg/execution/variablecontext/provider.go	51.51% <0.00%> (ø)
apis/execution/v1alpha1/zz_generated.deepcopy.go	56.61% <100.00%> (ø)
pkg/core/validation/generic.go	100.00% <100.00%> (ø)
pkg/execution/mutation/mutation.go	84.61% <100.00%> (+0.24%)	⬆️
pkg/execution/validation/validation.go	92.01% <100.00%> (+0.06%)	⬆️
pkg/utils/execution/job/task_utils.go	94.23% <100.00%> (ø)
... and 1 more

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