Fix struct generation in execution file

[honnix]

TL;DR

Fix struct generation in execution file

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

Simply encoding the whole struct would result wrong yaml file. AsMap does the proper convertion.

Tracking Issue

Fixes flyteorg/flyte#2682

Follow-up issue

NA

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (043a611) 67.35% compared to head (1066974) 68.04%.

❗ Current head 1066974 differs from pull request most recent head 2f6e344. Consider uploading reports for the commit 2f6e344 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #434      +/-   ##
==========================================
+ Coverage   67.35%   68.04%   +0.69%     
==========================================
  Files         148      148              
  Lines        6579     5482    -1097     
==========================================
- Hits         4431     3730     -701     
+ Misses       1858     1460     -398     
- Partials      290      292       +2     

Flag	Coverage Δ
unittests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
cmd/get/execution_util.go	60.22% <40.00%> (+3.62%)	⬆️

... and 135 files with indirect coverage changes

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[honnix]

@kumare3 Thanks for reviewing. Could you please also help merge it?