* `MysqlDateTimeWithTimeZone` inherits from `ActiveRecord::Type::DateTime`
  (`MysqlDateTime` is not present in Rails 5)
* explicitly set `NULL` default value for `merge_request_diff_files`'s
  `diff` column (otherwise empty string is used in a migration) and
  empty string is not allowed for text/blob fields in Mysql
* disable NO_ZERO_DATE mode for all Mysql DB connections, otherwise
  SQL queries fail on inserting `0` value for `created_at` column

Fix diff comment alignment for parallel code additions

Closes #47861

See merge request gitlab-org/gitlab-ce!20006

Move boards modal EmptyState vue component

See merge request gitlab-org/gitlab-ce!20068

Fix multiple active tabs when Crowd or LDAP is in use

Closes #48192

See merge request gitlab-org/gitlab-ce!20049

Unify spec/support/shared_examples/features/project_features_apply_to_issuables_shared_examples.rb

See merge request gitlab-org/gitlab-ce!20073

Allow omnibus to disable sourcemaps in memory constrained environments

See merge request gitlab-org/gitlab-ce!20053

Add `gitlab` chart documentation

See merge request gitlab-org/gitlab-ce!20056

CE: Resolve "Extract EE specific files/lines for project_creator_spec"

See merge request gitlab-org/gitlab-ce!19850

Follow-up to !19808: Split up for-loop initializations

See merge request gitlab-org/gitlab-ce!19915

Restore custom hooks for wiki

See merge request gitlab-org/gitlab-ce!20065

Changes tab VUE refactoring

Closes #42882

See merge request gitlab-org/gitlab-ce!17011

[Rails5] Set request.format in commits_controller

Closes #48144 et #48143

See merge request gitlab-org/gitlab-ce!20023

Add enabled prefix to feature keys to be consistent with other keys

See merge request gitlab-org/gitlab-ce!20043

Properly detect label reference if followed by period or question mark

See merge request gitlab-org/gitlab-ce!19965

[Rails5] Fix ActionCable's mount_path configuration

See merge request gitlab-org/gitlab-ce!20051

Rails 5 fix Capybara::ElementNotFound: Unable to find visible css #modal-revert-commit

Closes #48140 et #48139

See merge request gitlab-org/gitlab-ce!20044

Raw changes calculation is Gitaly only now

Closes gitaly#1138

See merge request gitlab-org/gitlab-ce!20057

We need this because `expect_any_instance_of` doesn't work on
prepended models. Now we could use the same code between CE/EE

Add a cop for `FinderMethods`

Closes #42705

See merge request gitlab-org/gitlab-ce!19951

Closes https://gitlab.com/gitlab-org/gitaly/issues/1138

[ci skip]

Fix a couple Vuex typos

See merge request gitlab-org/gitlab-ce!20046

Docs: update style guidelines with rules for navigation items

See merge request gitlab-org/gitlab-ce!20024

Fix N+1 queries in uploads check rake task

Closes #47924

See merge request gitlab-org/gitlab-ce!20012

The original MR [1] fixed red specs for Rails 5.
But while the failed specs were fixed, that changes brought new failed
specs which weren't caught up in [1].

This commit just fixes the fix. :)

New errors are like these:

```
Failed to upgrade to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: keep-alive, HTTP_UPGRADE: )
Finished "/-/boards/1/lists"[non-WebSocket] for 127.0.0.1 at 2018-06-20 18:09:26 +0200
```

[1]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20015

Fall back to the first sign-in tab if the local storage value is bad

See merge request gitlab-org/gitlab-ce!20050

Don't generate `.mo` files

Closes #47979

See merge request gitlab-org/gitlab-ce!20048

If `current_signin_tab` is `#crowd`, then no tab will be active. Fix
this by using the first available tab.

Relates to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20049#note_82996324

Resolve "Web IDE "Commit" button should indicate when there's a subsequent step"

Closes #48133

See merge request gitlab-org/gitlab-ce!20030

Since we are only using `.po` files for translation we can shave off
some setup time.

Generating the `mo` files also regenerates the PO-files, including
fuzzy translations. Those cause a lot of bugs, and we don't need them
anymore since the `po` files are generated by an external translation service.