refactor: consolidate cloud-node-manager addon spec

[jackfrancis]

Reason for Change:

Eases maintenance of the cloud-node-manager addon by consolidating manifests into a single YAML file that uses Go templating.
Issue Fixed:

Addresses #3188.

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[jackfrancis]

cc @chewong to sanity check that this is the only version-specific aspect of this spec

[chewong]

That's right.

[acs-bot]

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[codecov]

Codecov Report

Merging #3363 into master will increase coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3363      +/-   ##
==========================================
+ Coverage   72.16%   72.23%   +0.07%     
==========================================
  Files         147      147              
  Lines       25419    25392      -27     
==========================================
  Hits        18343    18343              
+ Misses       5939     5912      -27     
  Partials     1137     1137              

Impacted Files	Coverage Δ
pkg/engine/templates_generated.go	45.13% <0.00%> (+0.65%)	⬆️

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