Runtime bundles / MSIs don't honor user-relocated installation directory

Discovered by inspection in code review in https://github.com/dotnet/arcade/pull/7855

The existing MSI and bundle authoring for the runtime installers doesn't look at the previous location of a product it is replacing, however the SDK bundle permits relocating these to a user specified location.

The result would be:
1. User installs SDK to user specified location.
2. User installs upgrade runtime bundle (eg: serviced runtime bundle).

Expected:
Upgrade runtime is placed in user specified location

Actual:
Upgrade runtime is placed in default location.

This is happening because the only logic for retargeting these installers is in the SDK's bundle.