Update swhid according to latest specification

This updates the deposit_swh_id_context id following the latest specification, for example, from:

{
 'deposit_swh_id_context': 'swh:1:dir:d83b7dda887dc790f7207608474650d4344b8df9;origin=https://forge.softwareheritage.org/source/jesuisgpl/',
 ...
 'deposit_id': '11',
 'deposit_status': 'done',
 'deposit_swh_id': 'swh:1:dir:d83b7dda887dc790f7207608474650d4344b8df9',
 'deposit_swh_anchor_id': 'swh:1:rev:e76ea49c9ffbb7f73611087ba6e999b19e5d71eb',
 'deposit_swh_anchor_id_context': 'swh:1:rev:e76ea49c9ffbb7f73611087ba6e999b19e5d71eb;origin=https://forge.softwareheritage.org/source/jesuisgpl/',
 'deposit_status_detail': 'The deposit has been successfully \
                           loaded into the Software Heritage archive'
}

To:

{

 'deposit_swh_id_context': 'swh:1:dir:d83b7dda887dc790f7207608474650d4344b8df9;origin=https://forge.softwareheritage.org/source/jesuisgpl/;visit=swh:1:snp:68c0d26104d47e278dd6be07ed61fafb561d0d20;anchor=swh:1:rev:e76ea49c9ffbb7f73611087ba6e999b19e5d71eb;path=/',
...
 'deposit_id': '11',
 'deposit_status': 'done',
 'deposit_swh_id': 'swh:1:dir:d83b7dda887dc790f7207608474650d4344b8df9',
 'deposit_swh_anchor_id': 'swh:1:rev:e76ea49c9ffbb7f73611087ba6e999b19e5d71eb',
 'deposit_swh_anchor_id_context': 'swh:1:rev:e76ea49c9ffbb7f73611087ba6e999b19e5d71eb;origin=https://forge.softwareheritage.org/source/jesuisgpl/',
 'deposit_status_detail': 'The deposit has been successfully \
                           loaded into the Software Heritage archive'
}

Note:

• The deposit_swh_anchor_id and deposit_swh_anchor_id_context fields are no longer needed but are kept for now.

• A slight change in that api, this now requires the client (deposit loader in that context) to send all the required information now. The loader already did but it was not required by that api.

• This diff does not deal with the migration of the existing deposits to the new swhid format. Nor with dropping the "unnecessary" columns. That can be done later (and in other diffs).

Related to #2398 (closed)

Test Plan

tox

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Migrated from D3141 (view on Phabricator)