Enable HAML-LINT linters

Closes #22072

See merge request !8247

Improved the u2f flow

Closes #18556

See merge request !8304

Make tabs full-width at small viewport

Closes #26201

See merge request !8369

Fix failures in default sort order spec

See merge request !8379

Fix redirect after update file when user has forked project

Closes #25578

See merge request !8371

Test cases were not waiting for page load after clicking.
This caused failures in test cases that were executed right after
these incorrect ones, because of requests hitting server after
a test was finished.
We do not have to click links, we can go directly to a correct page
by passing parameters in the URL.

Merged the 'groups' and 'projects' tabs when viewing user profiles

Closes #24752

See merge request !8323

Fix boards search typo

See merge request !8370

fixes too short input for placeholder message in commit listing page

Closes #26192

See merge request !8367

Move award emoji's out of the discussion tab for merge requests

Closes #25996

See merge request !8358

Parse JIRA issue references even if Issue Tracker is disabled

Closes #25682

See merge request !8238

Re-enable submit button after username change failure

Closes #25829

See merge request !8332

Miscellaneous improvements to the nested groups feature

See merge request !8308

* Simplify code around group parent access check
* Rename 'Nested groups' to 'Subgroups' tab at group#show page
Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>