Ensure illink packages flow to source build

[tlakollo]

Currently, runtime generates the Microsoft.NET.ILLink.Tasks.nupkg as part of the Default subset command, its still missing a CI leg that actually executes this command, but after that is done we need to ensure that all the previous references from dotnet/linker get changes to runtime. This includes changing the references to the source build inside SDK and installer.

Also, we need to add this same metadata into the Version.Details.xml in runtime for the dotnet/cecil repository

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Issue Details

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Currently, runtime generates the Microsoft.NET.ILLink.Tasks.nupkg as part of the Default subset command, its still missing a CI leg that actually executes this command, but after that is done we need to ensure that all the previous references from dotnet/linker get changes to runtime. This includes changing the references to the source build inside SDK and installer.

Also, we need to add this same metadata into the Version.Details.xml in runtime for the dotnet/cecil repository

Author:	tlakollo
Assignees:	-
Labels:	untriaged, area-Tools-ILLink
Milestone:	-

[tlakollo]

Closed via dotnet/installer#15389, dotnet/sdk#30256, #81756