Add support for gate nodes

[eapolinario]

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TL;DR

Add support for gate nodes

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

handle gate nodes in hydrateNode.

Tracking Issue

flyteorg/flyte#3461

Follow-up issue

NA

[codecov]

Codecov Report

Merging #399 (90c01cb) into master (e55c649) will increase coverage by 0.78%.
The diff coverage is 100.00%.

❗ Current head 90c01cb differs from pull request most recent head 064700e. Consider uploading reports for the commit 064700e to get more accurate results

@@            Coverage Diff             @@
##           master     #399      +/-   ##
==========================================
+ Coverage   66.57%   67.35%   +0.78%     
==========================================
  Files         145      145              
  Lines        6270     5235    -1035     
==========================================
- Hits         4174     3526     -648     
+ Misses       1816     1429     -387     
  Partials      280      280              

Flag	Coverage Δ
unittests	?

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Impacted Files	Coverage Δ
cmd/register/register_util.go	78.25% <100.00%> (+2.37%)	⬆️

... and 133 files with indirect coverage changes

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