Fix getting release by tag in lazy mode (#3469)

Getting a release by tag cannot return a lazy release. The URL that is
used to fetch the release by tag cannot be used for subsequent requests
(like getting assets). The URL first has to be turned into the URL that
contains the release id. This requires an API call.

Supersedes #3468. Fixes #3467.

Co-authored-by: Sebastien NICOT <sebastien.nicot@enterprisedb.com>