feat: HMR respect baseHref

[princemaple]

Command

serve

Description

HMR via /@ng/... doesn't use the baseHref

I sometimes start multiple ng serve and use a reverse proxy to serve the apps during dev. So far everything respects baseHref and this worked flawlessly. HMR is the first thing that I encountered that not respecting baseHref and breaking my reverse proxy.

Describe the solution you'd like

HMR should consider baseHref, serving dynamic content via /base/@ng/...

Describe alternatives you've considered

I'll have to switch between apps... 🤷

[alan-agius4]

Hi @princemaple, this is the same root cause as #29248

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