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common/identifiers: Remove branch name processing in SWHID resolver

Description

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 T3195