#minor Spark and all pods in Flyte can now have global DNS config

[akumor]

TL;DR

This PR adds a new flag that can allow admins to configure DNS for pods launched by Flyte.
This should be superseded by - flyteorg/flyte#2069

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

NA

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[codecov]

Codecov Report

Merging #235 (6f7516e) into master (590813b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #235      +/-   ##
==========================================
+ Coverage   62.42%   62.44%   +0.01%     
==========================================
  Files         142      142              
  Lines        8833     8837       +4     
==========================================
+ Hits         5514     5518       +4     
  Misses       2819     2819              
  Partials      500      500              

Flag	Coverage Δ
unittests	62.06% <100.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
go/tasks/pluginmachinery/flytek8s/config/config.go	50.00% <ø> (ø)
go/tasks/pluginmachinery/flytek8s/pod_helper.go	76.64% <100.00%> (+0.23%)	⬆️
go/tasks/plugins/k8s/spark/spark.go	78.54% <100.00%> (+0.15%)	⬆️

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