refactor: consolidate aci-connector addon spec

[jackfrancis]

Reason for Change:

Eases maintenance of the aci-connector 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:

[codecov]

Codecov Report

Merging #3358 into master will decrease coverage by 0.10%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master    #3358      +/-   ##
==========================================
- Coverage   72.37%   72.26%   -0.11%     
==========================================
  Files         147      147              
  Lines       25305    25383      +78     
==========================================
+ Hits        18314    18343      +29     
- Misses       5856     5903      +47     
- Partials     1135     1137       +2     

Impacted Files	Coverage Δ
pkg/engine/templates_generated.go	45.35% <77.77%> (-0.83%)	⬇️
pkg/api/defaults.go	92.65% <0.00%> (+0.06%)	⬆️
pkg/api/vlabs/validate.go	80.52% <0.00%> (+0.15%)	⬆️

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[mboersma]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, mboersma

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[acs-bot]

New changes are detected. LGTM label has been removed.