Issue 24003 - mangle inferred return/scope attributes in parameters

[dkorpel]

Let's see how much ruckus this causes on buildkite

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✗	24003	normal	return/scope inference does not end up in type to some degree

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#15333"

[WalterBright]

Just to be clear, this PR has the delegates get return and scope mangled in?

I agree, that is the best way forward. Anything else is hopeless.

[dkorpel]

This applies to all parameters in the parameter list, but not the implicit this / delegate context parameter yet.

[dkorpel]

buildkite/ddox fails because its documentation (based on dmd's json output) now includes new scope annotations on parameters