Remove setting $ORIGIN/netcoredeps rpath

[elinor-fung]

The original use case for setting the RPATH was self-contained Linux apps.

Some time between .NET 6 and .NET 8, we started using a newer linker, such that this setting sets RUNPATH instead of RPATH. This meant it only applied to the host executable, not the runtime libraries (like coreclr).

Per #114393 (comment), the netcoredeps behaviour was from a time when our dependencies were more complicated and even its intended use case has no support story.

See

• DllImport: native libraries no longer loaded from netcoredeps subdirectory after upgrade to .NET 8 #114393
• [Breaking change]: .NET Linux applications do not look in netcoredeps sub-directory for native libraries docs#45777

cc @am11 @jkotas @dotnet/interop-contrib

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[jkotas]

Thanks!