Merge branch '20204-new-issue-button-redirects-you-to-create-a-new-issue-after-logging-in' into 'master'

Resolve "New issue button redirects you to create a new issue after logging in"

Closes #20204

See merge request !10153

Remove Tags filter from Projects Explore dropdown

Closes #28992

See merge request !10242

Implement new service for creating user

Closes #27878

See merge request !9220

Gem updates

See merge request !10237

Fix RSpec/DescribeSymbol cop violations

See merge request !10229

Fix projects_limit RangeError on user create

Closes #29116

See merge request !10209

Problems:

1. It's huge.
2. It's loaded on page load, which makes the page take 13 seconds.
3. It has a terrible UX.

Closes #28992

Fix up emoji tests that should be failing

See merge request !10231

Some discussion,
https://gitlab.slack.com/archives/C0GQHHPGW/p1490398531185144
 -> MR to fix failing emoji test:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10230

Resolve "Milestone with due date shows escaped HTML"

Closes #30035

See merge request !10224

Remove extra margin at bottom of todos page

Closes #28634

See merge request !10222

Adding non_archived scope for counting projects

Closes #23862

See merge request !8305

Change full colors to a more harmonious palette

Closes #28614

See merge request !10154

Show loading icon when changing filter in add issues modal

Closes #29615

See merge request !10043

Resolve "Gitlab administrator cannot create projects in every group"

Closes #27910

See merge request !9255

Remove forced scroll into view when switching to "Changes" MR tab

Closes #29897

See merge request !10194

Temporarily ignore Nokogiri CVE-2016-4658

See merge request !10218

Reset dropdown list when clicking filter input

Closes #28463

See merge request !10132

Fixes project list lines breaking

Closes #29018

See merge request !10178

See https://gitlab.com/gitlab-org/gitlab-ce/issues/29992 for progress on
updating this gem. In the meantime, we can't do anything about it
quickly, so we'll ignore the CVE in `bundle-audit`