I've demoted the ObjectStoreUploader to a concern that is mixed in
the concrete uploader classes that need to store files in a remote
object store.

I've been working on making the local -> remote migration working
first, which has been trivial compared to the remote -> local one.

The current implementation is heavily based on side-effects which
makes the code brittle and hard to reason about.

The current approach is to store the `store` field in the correct
`Upload` model once a migration has been done. To retrieve the field
I use the `has_many :uploads` relationship, with all the paths that
a certain file may have `uploads.where(path: paths).last`. This as
the drawback of adding a database query for every upload lookup, but
I feel that the generalization of this behavior is worth it. We should
be able to optimize this down the road quite easily.

Merge branch 'ee-29483-no-feedback-when-checking-on-checklist-if-potential-spam-was-detected' into 'master'

Port of 29483-no-feedback-when-checking-on-checklist-if-potential-spam-was-detected to EE

See merge request gitlab-org/gitlab-ee!3680

Fix/gb/fix pipeline build chain tag evaluation ee

See merge request gitlab-org/gitlab-ee!3686

Port of "es-module-compare" to EE

See merge request gitlab-org/gitlab-ee!3668

Clean up config docs for Geo

Closes #4287

See merge request gitlab-org/gitlab-ee!3697

Port from CE: Allow git pull/push on project redirects

See merge request gitlab-org/gitlab-ee!3666

Bump redis-rails to 5.0.2 to get redis-store security updates

Closes #40889

See merge request gitlab-org/gitlab-ce!15773

More details about troubleshooting inactive replication slot

See merge request gitlab-org/gitlab-ee!3688

Document Geo HA

Closes #3646

See merge request gitlab-org/gitlab-ee!3468

When a postgresql replication slot is not active, one should not just delete it.
Instead ask themselves, should it be active and if so, why isn't it active.

If they intent to not use it, they can remove it.

Add docs on tuning Geo for parallelism

See merge request gitlab-org/gitlab-ee!3665

Transfer job archives after creation

See merge request gitlab-org/gitlab-ee!3646

Resolve "Geo - Send GitLab version in status page and verify that all versions are the same"

Closes #2115

See merge request gitlab-org/gitlab-ee!3667

Port of mk-add-old-attachments-to-uploads-table to EE

See merge request gitlab-org/gitlab-ee!3401

Fix message when pushing to Geo secondary

Closes #3945

See merge request gitlab-org/gitlab-ee!3616

Use relative _path helper URLs in the GitLab UI -- EE merge edition

Closes gitlab-ce#40825

See merge request gitlab-org/gitlab-ee!3676

Resolve "GeoNodeStatus calculates numbers inefficiently"

Closes #3699

See merge request gitlab-org/gitlab-ee!3595

Add epic information to issue sidebar

Closes #3696

See merge request gitlab-org/gitlab-ee!3579

Integrated Browser Performance Testing

Closes #3046

See merge request gitlab-org/gitlab-ee!3507

Replace absolute URLs on related branches/MRs with relative url to avoid hostname -- EE merge edition

See merge request gitlab-org/gitlab-ee!3626

Add system notes for issue - epic association

Closes #3947

See merge request gitlab-org/gitlab-ee!3674