deep copying arraynode tasktemplate interface

[hamersaw]

Tracking issue

NA

Why are the changes needed?

ArrayNode strips the collection from the output type because it currently relies on registering a separate task with a wrapped collection to satisfy node output validators. The bug is that this stripped did no deep copy, so if multiple nodes stripped the outer collection, we would end up stripping mutliple layers if they existed.

What changes were proposed in this pull request?

In this PR we deep copy the interface of the TaskTemplate to ensure that multiple subNode executions do not strip mutliple List from the output variable type.

How was this patch tested?

The following workflow is a minimal repro:

@task(cache=True, cache_version="1.0")
def bAr(a: int) -> List[int]:
    return [a + 1, a + 2]

@task(cache=True, cache_version="1.0")
def bAr2(a: int) -> List[int]:
    return [a + 1, a + 2]

@workflow
def my_wf_2(a: int) -> List[List[int]]:
    x = bAr(a=a)
    return map_task(bAr2)(a=x)

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

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 60.99%. Comparing base (7d788cb) to head (ddd7c8c).
Report is 133 commits behind head on master.

Files with missing lines	Patch %	Lines
...g/controller/nodes/array/node_execution_context.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5479      +/-   ##
==========================================
+ Coverage   60.15%   60.99%   +0.83%     
==========================================
  Files         646      793     +147     
  Lines       45819    51350    +5531     
==========================================
+ Hits        27562    31319    +3757     
- Misses      15653    17145    +1492     
- Partials     2604     2886     +282     

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.70% <ø> (ø)
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	67.97% <ø> (?)
unittests-flyteidl	79.04% <ø> (ø)
unittests-flyteplugins	61.84% <ø> (ø)
unittests-flytepropeller	57.30% <0.00%> (-0.02%)	⬇️
unittests-flytestdlib	65.82% <ø> (ø)

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