Resolve "Background upload option is not effective"

Closes #4915

See merge request gitlab-org/gitlab-ee!4507

This reverts commit 54a575f1, reversing
changes made to c63af942.

Move uploads to object storage

Closes #4163

See merge request gitlab-org/gitlab-ee!3867

Can migrate LFS objects to S3 style object storage

Closes #2841

See merge request !2760

Object store for artifacts

Closes gitlab-ce#29203

See merge request !1762

If using gravatar.com, both plain_url and ssl_url in settings are now
served via HTTPS. Make this the default.

Instead of from the configuration file

On GitLab.com, we see that cron jobs sometimes don't run. This appears to be
because the process that polls for current cron jobs only has a 60 second
validity period, so if (for whatever reason) it misses those 60 seconds, we have
to wait until the next execution.

For the usage ping, this is particularly problematic, as that's only scheduled
to run once a week.

Changing it to run for every minute in a 10 minute period should work around
this, if the above diagnosis is correct. The job itself obtains an exclusive
lease for 24 hours, so rescheduling in quick succession is safe.

This is a follow-up to https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1956 and
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7308.

This reverts merge request !14148

Revert "Merge branch '35012-navigation-add-option-to-change-navigation-color-palette' into 'master'"

This reverts merge request !13619

An upcoming update to rubocop-gitlab-security added additional
violations.

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