[REPLCompletions] use better version of listing module imports for completions #58218
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The test for this crashes on my machine, leading me to notice that the implementation of this function was nonsense. Fortunately, we already had a more correct implementation of this function in the REPL docview code that we could borrow from to fix this.
While here, also filter out macros, since those are rather strange looking to see appearing in the results. We could alternatively use
Base.is_valid_identifier
, since the main point here is to print functions that are accessible in the module by identifier.