Unused binding warning isn't reported for recursive binding in a type

Consider the following type declaration:

type T() =
    let rec f x = ()
    and g x = ()

    do g ()

Earlier FCS versions would report f as unused with --warnon:1182 flag present, but the current main doesn’t report it anymore.

@psfinaki Could it be somehow related to #13429?

[dsyme]

Even just this is a repro:

type T() =
    let f _ = ()

[auduchinok]

Another difference is now FSharpSymbol produced for such a function returns different things:

• mfv.DeclaringEntity returns the containing type, previously it didn’t
• mfv.IsModuleValueOrMember is true (I think it has been false previously)