Fix. db:migrate is failed on MySQL 8

See merge request gitlab-org/gitlab-ce!28351

Resolve "Error 500 viewing admin/projects page: undefined method `storage_size' for nil:NilClass"

Closes #49915

See merge request gitlab-org/gitlab-ce!28355

Explain `render_if_exists` relative path

See merge request gitlab-org/gitlab-ce!28356

Resolve CE/EE diffs in _flash_messages

Closes gitlab-ee#11037

See merge request gitlab-org/gitlab-ce!28333

Resolve CE/EE diffs in _flash_messages

Closes #11037

See merge request gitlab-org/gitlab-ee!12726

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

Update Rubocop to 0.69.0 and other gems

See merge request gitlab-org/gitlab-ce!28345

Update Rubocop to 0.69.0 and other gems

See merge request gitlab-org/gitlab-ee!12750

Fixes style-lint issues for blocks.scss

Closes #59838

See merge request gitlab-org/gitlab-ce!28251

Include MR information if possible when emailing notification of closing an issue

Closes #19569

See merge request gitlab-org/gitlab-ce!15610

CE backport of "Fix a broken spec for EE"

See merge request gitlab-org/gitlab-ce!28357

Fix a broken spec for EE in spec/services/merge_requests/rebase_service_spec.rb

Closes #11621

See merge request gitlab-org/gitlab-ee!12775

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

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

Regen locale gitlab.pot file

See merge request gitlab-org/gitlab-ee!12774

Part of single codebase changes.

Part of single codebase changes.

Fixes issues with show whitespace button in diffs

Closes #42597 and #58852

See merge request gitlab-org/gitlab-ce!28242

```
StandardError: An error has occurred, all later migrations canceled:

Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'system = true AND note LIKE '\_%\_'' at line 1: UPDATE notes SET note = trim(both '_' from note) WHERE system = true AND note LIKE '\_%\_'
```

Add Let's Encrypt client

See merge request gitlab-org/gitlab-ce!27624

Part of adding Let's Encrypt certificates for pages domains

Add acme-client gem

Client is being initialized by private key stored in secrets.yml
Let's Encrypt account is being created lazily.
If it's already created, Acme::Client just gets account_kid by
calling new_account method

Make Let's Encrypt client an instance
Wrap order and challenge classes

Properly clear the merge error upon rebase failure

Closes #56139

See merge request gitlab-org/gitlab-ce!28319

i18n JS files starting with i

See merge request gitlab-org/gitlab-ce!28010

i18n JS files starting with i - EE

See merge request gitlab-org/gitlab-ee!12454

Resolve CE/EE diffs in accounts/show

Closes #11046

See merge request gitlab-org/gitlab-ee!12733

Resolve CE/EE diffs in help/index

Closes gitlab-ee#11051

See merge request gitlab-org/gitlab-ce!28335