When importing a GitHub pull request we would perform all work in a
single database transaction. This is less than ideal, because we perform
various slow Git operations when creating a merge request. This in turn
can lead to many DB connections being used, while just waiting for an IO
operation to complete.

To work around this, we now move most of the heavy lifting out of the
database transaction. Some extra error handling is added to ensure we
can resume importing a partially imported pull request, instead of just
throwing an error.

This commit also changes the specs for IssueImporter so they don't rely
on deprecated RSpec methods.

Backport EE SlashCommand Refactor

See merge request gitlab-org/gitlab-ce!19177

Rails5 fix arel from

Closes #46281

See merge request gitlab-org/gitlab-ce!19340

Update to GitLab Workhorse v4.3.0

See merge request gitlab-org/gitlab-ce!19313

Add ability to search wiki titles

Closes #34526

See merge request gitlab-org/gitlab-ce!19112

Fix N+1 with source_projects in merge requests API

See merge request gitlab-org/gitlab-ce!19346

Bump gitlab-shell to 7.1.3

See merge request gitlab-org/gitlab-ce!19358

Fixed typo in commit message help popover

Closes #47060

See merge request gitlab-org/gitlab-ce!19314

Fix intermittent failing spec in spec/support/helpers/cycle_analytics_helpers.rb

Closes #43981

See merge request gitlab-org/gitlab-ce!19338

Fix attr_encryption key settings

Closes #47166

See merge request gitlab-org/gitlab-ce!19341

Fix missing squash parameter in doc/api/merge_requests.md

See merge request gitlab-org/gitlab-ce!19260

Add per-project pipeline id (Use `AtomicInternalId`)

Closes #3691

See merge request gitlab-org/gitlab-ce!18558

This includes the change that prints the @username of a user instead
of the full name.

https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/204

Update IPs to valid example IPs.

Closes #47197

See merge request gitlab-org/gitlab-ce!19357

As per: https://tools.ietf.org/html/rfc5737

Resolve "URI::InvalidURIError: bad URI(is not URI?): users/xxx[bot]"

Closes #47193

See merge request gitlab-org/gitlab-ce!19354

Update selenium-webdriver to 3.12.0

Closes #47183

See merge request gitlab-org/gitlab-ce!19351

Now that we are checking `MergeRequest#for_fork?`, we also need
the source project preloaded for a merge request.

There was a race condition in the spec where if the commit is created on disk
within a second of the frozen `Timecop` time, the test fails.

Closes #43981

Fix missing key change in 20171124104327_migrate_kubernetes_service_to_new_clusters_architectures.rb

attr_encrypted does different things with `key` depending on what mode you are using:

1. In `:per_attribute_iv_and_salt` mode, it generates a hash with the salt:
https://github.com/attr-encrypted/encryptor/blob/c3a62c4a9e74686dd95e0548f9dc2a361fdc95d1/lib/encryptor.rb#L77.
There is no need to truncate the key to 32 bytes here.

2. In `:per_attribute_iv` mode, it sets the key directly to the password, so
truncation to 32 bytes is necessary.

Closes #47166

Fix bootstrap 4 file inputs

Closes #46701

See merge request gitlab-org/gitlab-ce!19333

Add comment about the need for truncating keys in Ruby 2.4

See merge request gitlab-org/gitlab-ce!19330

[ci skip]

Use RequestStore to memoize Flipper features so that memoized values are cleared between requests

See merge request gitlab-org/gitlab-ce!19281

https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/71887977 was failing
due to confusion between Ci::Group and Group.
https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/71887977

Upgrade to Ruby 2.4.4

See merge request gitlab-org/gitlab-ce!19055

Revert "Merge branch '46833-sticky-polyfill' into 'master'"

See merge request gitlab-org/gitlab-ce!19322

Resolve "Branch names in system notes have incorrect color"

Closes #46696

See merge request gitlab-org/gitlab-ce!19296