Closes gitaly#737

See https://gitlab.com/gitlab-org/gitlab-ce/issues/40690 and
https://github.com/mbleigh/seed-fu/issues/123 for details.
Signed-off-by: Rémy Coutable <remy@rymai.me>

After installing a new gem, batch-loader, a construct can be used to
queue data to be fetched in bulk. The gem was also introduced in both
gitlab-org/gitlab-ce!14680 and gitlab-org/gitlab-ce!14846, but those mrs
are not merged yet.

For the generation of diffs, both the old blob and the new blob need to
be loaded. This for every file in the diff, too. Now we collect all
these so we do 1 fetch. Three `.allow_n_plus_1_calls` have been removed,
which I expect to be valid, but this needs to be confirmed by a full CI
run.

Possibly closes:
- https://gitlab.com/gitlab-org/gitlab-ce/issues/37445
- https://gitlab.com/gitlab-org/gitlab-ce/issues/37599
- https://gitlab.com/gitlab-org/gitlab-ce/issues/37431

Closes gitaly#673

We also unify conversions from and to `Gitaly::User`s in the
`Gitlab::Git::User` class.

The fog-aliyun gem had a bug in v0.1.0 for file storage creation/update. This merge requests update the gem to v0.2.0 which contains the fix:

https://github.com/fog/fog-aliyun/commit/a7456ca6b63e5a0d88c849914679d2fa4707c10c

Closes #39126

Closes gitaly#638

Closes gitaly#562

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

This recent update fixes an issue in grape_logging where the status
code would be "fail" for any non-20x responses. For more details, see:
https://github.com/aserafin/grape_logging/issues/29

Signed-off-by: Rémy Coutable <remy@rymai.me>

Closes #36189

Previous versions of jira-ruby gem would generate erroneous URLs when an HTTP
proxy were confused via the `http_proxy` environment variables:
https://github.com/sumoheavy/jira-ruby/issues/250

Closes gitlab-org/gitlab-ee#3125

Changelog: https://git.io/v5403