add execution_version to ArrayNode proto

[pvditt]

Why are the changes needed?

Support toggling between subnode store and retain backwards compatibility.

What changes were proposed in this pull request?

Add execution_version to ArrayNode proto

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

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

Related PRs

Docs link

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 4.76190% with 20 lines in your changes missing coverage. Please review.

Project coverage is 35.90%. Comparing base (337088e) to head (84c4e42). Report is 135 commits behind head on master.

Files with missing lines	Patch %	Lines
flyteidl/gen/pb-go/flyteidl/core/workflow.pb.go	4.76%	20 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5512       +/-   ##
===========================================
- Coverage   60.98%   35.90%   -25.09%     
===========================================
  Files         796     1301      +505     
  Lines       51676   109419    +57743     
===========================================
+ Hits        31515    39287     +7772     
- Misses      17261    66035    +48774     
- Partials     2900     4097     +1197     

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (-17.95%)	:arrow_down:
unittests-flyteadmin	53.73% <ø> (-5.00%)	:arrow_down:
unittests-flytecopilot	12.17% <ø> (-5.62%)	:arrow_down:
unittests-flytectl	62.28% <ø> (-5.16%)	:arrow_down:
unittests-flyteidl	7.09% <4.76%> (-71.98%)	:arrow_down:
unittests-flyteplugins	53.31% <ø> (-8.46%)	:arrow_down:
unittests-flytepropeller	41.75% <ø> (-15.73%)	:arrow_down:
unittests-flytestdlib	55.27% <ø> (-10.42%)	:arrow_down:

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