chore: remove pre-1.14 addons specs

[jackfrancis]

Reason for Change:

This PR removes deprecated addons specs.

Issue Fixed:

Requirements:

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

Notes:

[codecov]

Codecov Report

Merging #3081 into master will increase coverage by 0.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3081      +/-   ##
==========================================
+ Coverage   70.58%   70.89%   +0.30%     
==========================================
  Files         145      145              
  Lines       25219    25111     -108     
==========================================
  Hits        17802    17802              
+ Misses       6312     6204     -108     
  Partials     1105     1105              

Impacted Files	Coverage Δ
pkg/engine/templates_generated.go	32.45% <ø> (+1.45%)	⬆️

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[mboersma]

/lgtm