common/identifiers: Remove branch name processing in SWHID resolver
Previously the SWHID resolver was trying to associate a branch name to a revision by checking tip revisions in snapshot branches list.
That operation is not really needed, can be costly to execute and can lead to regressions in SWHID resolving so remove it.
Related to #3195 (closed)
Migrated from D5404 (view on Phabricator)