Forwarding activation signal (follow up)

[jkotas]

Is there a follow up to do for this?

• This will re-introduce the potential GC starvation when multiple runtimes are loaded in the process.
• NativeAOT has the same pattern. Is it not a problem there?

Originally posted by @jkotas in #124877 (comment)

[janvorli]

This should be re-enabled as soon as the related debugging tools issue gets fixed.
cc: @steveisok