helm: keep namespace in manager.yaml and remove from helm overlay

[eguzki]

Updates changes merged in #904

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.61%. Comparing base (63f1d28) to head (b91a9f0).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #934      +/-   ##
==========================================
+ Coverage   81.49%   81.61%   +0.11%     
==========================================
  Files         102      115      +13     
  Lines        7177     7700     +523     
==========================================
+ Hits         5849     6284     +435     
- Misses        898      983      +85     
- Partials      430      433       +3     

Flag	Coverage Δ
bare-k8s-integration	9.66% <ø> (+0.77%)	⬆️
controllers-integration	71.82% <ø> (+6.49%)	⬆️
envoygateway-integration	49.13% <ø> (-1.17%)	⬇️
gatewayapi-integration	14.56% <ø> (+0.16%)	⬆️
istio-integration	51.52% <ø> (-2.00%)	⬇️
unit	30.55% <ø> (+2.21%)	⬆️

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

Components	Coverage Δ
api/v1beta1 (u)	90.90% <ø> (ø)
api/v1beta2 (u)	86.61% <ø> (ø)
pkg/common (u)	88.13% <ø> (ø)
pkg/istio (u)	71.51% <100.00%> (ø)
pkg/log (u)	94.73% <ø> (ø)
pkg/reconcilers (u)	∅ <ø> (∅)
pkg/rlptools (u)	85.00% <ø> (-0.84%)	⬇️
controllers (i)	82.82% <81.98%> (-0.24%)	⬇️

see 11 files with indirect coverage changes