User Story:

As a consumer (managed services) I want hypershift to support sharedingress
As a dev I want to transition towards a prod ready solution iteratively

Acceptance Criteria:

A shared ingress solution poc is merged and let Azure e2e pass https://docs.google.com/document/d/1o6kd61gBVvUtYAqTN6JqJGlUAsatmlq2mmoBkQThEFg/edit#heading=h.hsujpqw67xkr

The initial goal is to start transitioning the code structure (reconcilers, APIs, helpers...) towards a shared ingress oriented solution using haproxy as presented above for simplicity.
Then we can iteratively follow up to harden security, evaluate more sophisticated alternatives and progress towards being prod ready.