Add test helm upgrade path

[eguzki]

What

Implements #1123

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.42%. Comparing base (9f79273) to head (1784199).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1156      +/-   ##
==========================================
- Coverage   83.63%   83.42%   -0.22%     
==========================================
  Files          81       81              
  Lines        6943     6943              
==========================================
- Hits         5807     5792      -15     
- Misses        913      925      +12     
- Partials      223      226       +3     

Flag	Coverage Δ
bare-k8s-integration	22.70% <ø> (-0.19%)	⬇️
controllers-integration	74.79% <ø> (-0.17%)	⬇️
envoygateway-integration	39.91% <ø> (-0.70%)	⬇️
gatewayapi-integration	19.64% <ø> (+0.17%)	⬆️
istio-integration	43.27% <ø> (ø)
unit	19.57% <ø> (ø)

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

Components	Coverage Δ
api/v1beta1 (u)	90.00% <ø> (ø)
api/v1beta2 (u)	∅ <ø> (∅)
pkg/common (u)	∅ <ø> (∅)
pkg/istio (u)	62.06% <ø> (ø)
pkg/log (u)	93.18% <ø> (ø)
pkg/reconcilers (u)	24.67% <ø> (ø)
pkg/rlptools (u)	∅ <ø> (∅)
controllers (i)	86.76% <ø> (-0.07%)	⬇️

see 5 files with indirect coverage changes