cmd/compile: better error msg for impossible type assertions

[howjmay]

Revise the error message under the condition that type assertion has
mismatching pointer/non-pointer type, which means this PR adds a
better error hint for the situation that a user writes x.(*I), but they
meant to write x.(I).

In this situation, compiler would check out whether the the missing
methods are implemented by the dereferenced object. If the dereferenced
object implements these missing methods, then return error message
<original_object> does not have <missing_method> (but <dereferenced_object> does)

Fixes #43673

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