`#defined` symbols do not get recommended if not defined in compilation options

Creating a separate issue to track this behavior without closing the original one (see attached below).

> Even #defined symbols do not appear right now.
>
> I would be ok with a PR fixing that.
>
>

_Originally posted by @CyrusNajmabadi in [#76469](https://github.com/dotnet/roslyn/issues/76469#issuecomment-2549221812)_

Start by reading the discussion in the linked original issue #76469, especially the quoted comment, to understand the recommendation behavior and relevant Roslyn subsystem. No source file or test is named in this issue; done means that symbols declared with #define are recommended even when they are absent from compilation options.

Written by the indexing model from the issue text.