feat: Add support for rootService within ALB traffic routing

[dthomson25]

No description provided.

[codecov-commenter]

Codecov Report

Merging #634 into master will decrease coverage by 0.03%.
The diff coverage is 72.22%.

@@            Coverage Diff             @@
##           master     #634      +/-   ##
==========================================
- Coverage   85.29%   85.25%   -0.04%     
==========================================
  Files          88       88              
  Lines        8642     8654      +12     
==========================================
+ Hits         7371     7378       +7     
- Misses        899      903       +4     
- Partials      372      373       +1     

Impacted Files	Coverage Δ
pkg/apis/rollouts/validation/validation.go	90.22% <0.00%> (-1.38%)	⬇️
.../apis/rollouts/validation/validation_references.go	77.14% <57.14%> (-1.86%)	⬇️
rollout/trafficrouting/alb/alb.go	97.40% <100.00%> (+0.06%)	⬆️
utils/ingress/ingress.go	100.00% <100.00%> (ø)

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[khhirani]

LGTM