Handle removed source projects in MR CI commits

Fixes #3599 

@dzaporozhets assigning this to you since you wrote the original code. Perhaps checking for the source project isn't the right way, but I'm not sure if there's a better way (e.g. somewhere earlier in the process) that we can detect this.

See merge request !1859

Port GitLab EE ProjectsFinder changes

These changes were added in GitLab EE commit
d39de0ea91b26b8840195e5674b92c353cc16661. The tests were a bit bugged
(they used a non existing group, thus not testing a crucial part) which
I only noticed when porting CE changes to EE.

See merge request !1854

Reduce method complexity in AutocompleteController

Backport of gitlab-org/gitlab-ee!58

See merge request !1833

When calling MergeRequest#ci_commit the code would previously raise an
error if the source project no longer existed (e.g. because the user
removed their fork).

See #3599 for more information.

fix syntax error in common.scss

Fix a syntax error.

See merge request !1857

Fix Drone web hook URL not being updated

Fixes regression of !1774: fixes Drone Web hook for both service templates and project services.



See merge request !1856

These changes were added in GitLab EE commit
d39de0ea91b26b8840195e5674b92c353cc16661. The tests were a bit bugged
(they used a non existing group, thus not testing a crucial part) which
I only noticed when porting CE changes to EE.

Bump GitLab Workhorse version to 0.4.2



See merge request !1830

Add support for batch download operation

- Drops Accept for all download requests,
- Allows to do batch download for public projects and non-authorized users
- Returns 501 for legacy API with message to upgrade the client

/cc @marin @jacobvosmaer @yorickpeterse 

See merge request !1842

Fix for Emoji



See merge request !1849

Lfs default and backup

Part of gitlab-org/gitlab-ce#2955

See merge request !1823

More GitLab spellings. No dedicated CI in omnibus



See merge request !1838

Update LFS docs for cloning

Cloning the repo already downloads the LFS tracked files.

See merge request !1839

Add clipboard button to merge request cross-project reference

See merge request !1847

Add a fallback for Safari copy-to-clipboard

Also, hide the tooltip in a less stupid way.

Closes #3547

See merge request !1844

Commits without .gitlab-ci.yml are marked as skipped

- Commits without .gitlab-ci.yml are marked as skipped
- Save detailed error when YAML syntax

This also fixes: #3521 #3546 

/cc @jacobvosmaer 


See merge request !1827

Award Emoji

This it first iteration of award emoji feature.
We have plan to extend emoji picker by the next release.

For now, you can add award by clicking to the emoji picker or posting a regular comment with emoji like "👍" and any other. You can post not only emoji that listed in the emoji picker.

See merge request !1825

Add missing dot in confirm modal



See merge request !1645

Also, hide the tooltip in a less stupid way.

Closes #3547

Improve performance of finding issues with/without labels

The changes in this MR ultimately lead to finding issues with(out) labels being about 2x faster due to:

1. Newly added indexes on `issues.state` and `projects.visibility_level`
2. Adjusting the query so that finding issues for multiple projects is more efficient

See merge request !1787

Improve personal snippet access workflow.

Replaces !1709

Fixes #3258

See merge request !1817

Add option to create merge request when editing/creating a file

Replaces !1611 

Fixes #3059

See merge request !1820

Fix 'Attach a file' link in new tag form

Also removed a little bit of code repetition :)

See merge request !1834

Update gitlab-shell documentation to 2.6.7



See merge request !1836