swh.deposit.parsers: Do not lose information during parsing
The current behavior of the internal libraries that parses the xml into dict merges entries with the same name.
In effect, we are losing information (e.g author). That's not a correct behavior (e.g author, license, ...) and the diff fixes that.
Close #1131 (closed)
Test Plan
Tests ok
Migrated from D353 (view on Phabricator)