Wrong symbol use is reported for custom operation overloads by `GetAllUsesOfAllSymbolsInFile`

An extraction of an issue from https://github.com/dotnet/fsharp/issues/11612#issuecomment-955456986.

When there're multiple overloads of a custom operation, a wrong overload item is reported to the sink.
```fsharp
type FooBuilder() =
member _.Yield _ = 1

[]
member _.Create(i1: int, s: string, i2: int) = 1

[]
member _.Create(i: int, s1: string, s2: string) = 1

FooBuilder() {
create "" 1
create "" ""
}
```