Display and logic improvements for cycle analytics

Closes #30138

See merge request gitlab-org/gitlab-ce!28507

(CE port) Resolve "New user flow for SSOing into a GitLab.com group"

See merge request gitlab-org/gitlab-ce!26578

- Add .no-tabs to login-box
- Externalize strings in common signup box
- Leverage render_if_exists
- Update PO file

Resolve "New user flow for SSOing into a GitLab.com group"

Closes #5292 and #9375

See merge request gitlab-org/gitlab-ee!10338

Users should be able tu sign up automatically
if their current account is not eligible
to join the group or if they have no gitlab account

Resolve "Moving an issue results in broken image links in comments"

Closes #57825

See merge request gitlab-org/gitlab-ce!28654

CE-port of Refactor EE specific params override in API::Groups

See merge request gitlab-org/gitlab-ce!28610

Refactor EE specific params override in API::Groups

See merge request gitlab-org/gitlab-ee!13175

Regenerate gitlab.pot file

See merge request gitlab-org/gitlab-ee!13411

i18n boards store directory

See merge request gitlab-org/gitlab-ce!28712

Edit account limit settings to comply with SSOT guidelines

See merge request gitlab-org/gitlab-ce!28532

EE port: Make external_dashboard_url available to frontend

See merge request gitlab-org/gitlab-ee!12345

- Modify it to test the EE keys in metrics_data rather than all keys,
some of which are defined in the CE EnvironmentsHelper.

Add details of the Admin Area's *Users* page

See merge request gitlab-org/gitlab-ce!28509

Remove EE specific lines from spec/lib/system_check/app/git_user_default_ssh_config_check_spec.rb

Closes #6495

See merge request gitlab-org/gitlab-ee!13166

Resolve "Extract EE specific files/lines for spec/controllers/admin"

Closes #6569

See merge request gitlab-org/gitlab-ee!13280

Resolve "Extract EE specific files/lines for spec/features/admin"

Closes #6572

See merge request gitlab-org/gitlab-ee!13378

Add LFS pull mirroring to docs

See merge request gitlab-org/gitlab-ce!28686

Remove the circuit breaker API

Closes #52467

See merge request gitlab-org/gitlab-ce!28669

Resolve "Style secondary button type to be aligned with pattern library"

See merge request gitlab-org/gitlab-ce!27920

Fix bug candidates of forms on Bootstrap Grid system

Closes #57189

See merge request gitlab-org/gitlab-ce!24885

Added parent table row to files table

See merge request gitlab-org/gitlab-ce!28658

Masked should be Boolean type

See merge request gitlab-org/gitlab-ce!28758