Follow-up from "Update BulkImports http client to use /metadata to fetch source version"

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The following discussion from !103639 (merged) should be addressed:

• @georgekoltsov started a discussion: (+2 comments)

  @rodrigo.tomonari may I ask you to have a look at this one? Thanks 🙇

Later on, past 16.0, we can start using /metadata endpoint first and then fallback to /version, as it feels like there are more gitlab instances with /version endpoint vs /metadata endpoint

Mentions #366319 (closed)