Rename 'git_metadata' to 'extra_headers'
Because they are now stored in the 'extra_headers' field instead of the 'metadata' field.
Motivation: consistency + keep it out of 'grep metadata */swh/ -r'
Migrated from D5254 (view on Phabricator)
Staging instance, all changes can be removed at any time
Because they are now stored in the 'extra_headers' field instead of the 'metadata' field.
Motivation: consistency + keep it out of 'grep metadata */swh/ -r'
Migrated from D5254 (view on Phabricator)