Delegate fast path construction checks for [UnmanagedCallersOnly] attribute

[davidwrighton]

This is inconsistent with other behavior around UnmanagedCallersOnly where misuse simply triggers a failfast. Consider removing this check.

Check that is inconsistent with policy.

runtime/src/coreclr/vm/comdelegate.cpp

Line 2796 in 6b4ee34

// Do not allow static methods with [UnmanagedCallersOnlyAttribute] to be a delegate target.

Commentary about this, #122656 (comment)

Test code that depends on the check

runtime/src/tests/Interop/UnmanagedCallersOnly/InvalidCallbacks.il

Line 140 in 6b4ee34

ldftn int32 InvalidCSharp.CallingUnmanagedCallersOnlyDirectly::ManagedDoubleCallback(int32)

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