At some point as part of the process of supporting renumbering data,
we changed the structure of our file uploads to expect `path` to match
`s3_path`, with both having the relative path within the overall
hierarchy (including the realm ID). This change updates the more
rarely-used S3 export code path to use that model, fixing a crash when
messages reference an Attachment object with a rewritten path_id.
The 'last_modified' value in emoji records is
needed for uploading the file to the S3 backend.
We set the same in the function 'import_uploads_s3'.
We also have to remove the keyword 'last_modified'
while building the RealmEmoji dict, as it is not
a field which exists in RealmEmoji objects.
For importing huddles we have to have unique huddle hashes.
Huddle hashes are extracted from the list of users participating
in a huddle. So to extract these user ids, we first use huddle
id to getting the matching recipient, and then we use subscription
to get the user ids from the recipient id.
Added tests for the same (tests slightly tweaked by tabbott).
In records the IDs like the realm_id and user_profile_id
of 'records.json' should be integers. This was missing in the
S3 backend and this commit fixes that.
Added tests for this as well.
For the emojis, In 'records.json', the record should contain
the attribute 'file_name', which was missing in the S3 backend.
This commit adds this attribute, as well as tests for the
records of uploads, avatars and emojis in both local and S3 backend.
