enabling parallelism controls on arraynode

[hamersaw]

Tracking issue

NA

Why are the changes needed?

missed in https://github.com/unionai/flyte/pull/229

What changes were proposed in this pull request?

Enabling parallelism application for ArrayNode from node executor.

How was this patch tested?

Local testing.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

NA

Docs link

NA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.82%. Comparing base (8eb7b0d) to head (22edde7).
Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5284       +/-   ##
===========================================
- Coverage   76.78%   56.82%   -19.96%     
===========================================
  Files          18       34       +16     
  Lines        1516     2154      +638     
===========================================
+ Hits         1164     1224       +60     
- Misses        288      837      +549     
- Partials       64       93       +29     

Flag	Coverage Δ
unittests	56.82% <ø> (-19.96%)	⬇️

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