feat(api): Update maxAttempts to int64

[irvinlim]

Updates maxAttempts to be int64 instead, there is no need to use int32.

[codecov]

Codecov Report

Merging #78 (f557758) into main (b94aa78) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #78   +/-   ##
=======================================
  Coverage   62.59%   62.59%           
=======================================
  Files         197      197           
  Lines        9872     9872           
=======================================
  Hits         6179     6179           
  Misses       3380     3380           
  Partials      313      313           

Impacted Files	Coverage Δ
apis/execution/v1alpha1/job_types.go	100.00% <ø> (ø)
apis/execution/v1alpha1/zz_generated.deepcopy.go	60.48% <100.00%> (ø)
pkg/execution/mutation/mutation.go	88.08% <100.00%> (ø)
pkg/execution/util/job/task_utils.go	94.23% <100.00%> (ø)
pkg/execution/validation/validation.go	91.94% <100.00%> (ø)

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