Reduce noise from Chatops output

Closes #5140

See merge request gitlab-org/gitlab-ee!4938

The various responses produced by Chatops no longer include Slack
buttons, instead returning the message as a link. This reduces the noise
caused by the (rather large) buttons. We also no longer send a response
if the build did not produce output as the default response could get
annoying very quickly.

Handle empty chat output better

See merge request gitlab-org/gitlab-ee!4933

Include the ee/ directory in backtraces

See merge request gitlab-org/gitlab-ee!4930

CE upstream - 2018-03-12 12:25 UTC

Closes #4281 and gitlab-ce#4281

See merge request gitlab-org/gitlab-ee!4931

Fix broken files blacklist link

See merge request gitlab-org/gitlab-ee!4873

If the output was empty we would end up running `''.split("\n")`,
producing an empty Array. Slicing an empty Array using a range such as
1..-1 would then produce a nil value, instead of an empty Array. This in
turn would cause a NoMethodError since "join" is not defined for
NilClass.

IDE: Load full Files structure through API

See merge request gitlab-org/gitlab-ee!4859

Add back deprecated Geo queues that were removed in 10.6

Closes #5219

See merge request gitlab-org/gitlab-ee!4928

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17640

Allow use of system git for git fetch if USE_SYSTEM_GIT_FOR_FETCH is defined

Closes #5214

See merge request gitlab-org/gitlab-ee!4929

# Conflicts:
#	app/assets/javascripts/boards/mixins/sortable_default_options.js
#	app/assets/javascripts/members.js
#	config/application.rb
#	ee/app/assets/images/illustrations/epics/roadmap.svg
#	ee/app/assets/images/illustrations/prometheus-graphs_empty.svg
#	ee/app/views/shared/empty_states/icons/_service_desk_callout.svg

[ci skip]

Resolve "Update zaproxy image in Auto DevOps template"

Closes #44096

See merge request gitlab-org/gitlab-ce!17683

Fix "Remove source branch" button in MR widget during MWPS state

Closes #42814 and #4281

See merge request gitlab-org/gitlab-ce!17192

CE upstream - 2018-03-09 18:26 UTC

Closes gitaly#1051

See merge request gitlab-org/gitlab-ee!4922

Require jQuery to be explicitly imported

See merge request gitlab-org/gitlab-ce!17674

Port of "Require jQuery to be explicitly imported" to EE

See merge request gitlab-org/gitlab-ee!4925

Update wording to specify create/manage project vs group labels in labels dropdown

Closes #43702

See merge request gitlab-org/gitlab-ce!17640

Closes #44096

Removes duplicated & non used code

See merge request gitlab-org/gitlab-ce!17667

We need to drain these queues before we can remove them completely.
Since the Log Cursor may be writing to these queues until it is
restarted, we can't guarantee that a Redis migration will properly
migrate everything.

Closes #5219

This is a workaround until we can ship git 2.16 with GitLab.

Closes #5214

Delete no longer required spec

See merge request gitlab-org/gitlab-ee!4924