Add support for PreReceiveError in UserMergeBranch RPC

Closes gitaly#979

See merge request gitlab-org/gitlab-ce!16765

Migrate Git::Repository#delete_refs to Gitaly

Closes gitaly#967

See merge request gitlab-org/gitlab-ce!16723

Closes gitaly#979

Closes gitaly#967

Reduce the cardinality of GitLab metrics

Closes #41771

See merge request gitlab-org/gitlab-ce!16443

Contribution calendar label cutoff fix

See merge request gitlab-org/gitlab-ce!16769

Migrate fetching wiki page formatted content to Gitaly

Closes gitaly#958

See merge request gitlab-org/gitlab-ce!16716

Ignore conflicts in db/schema.rb in Gitlab::EeCompatCheck

See merge request gitlab-org/gitlab-ce!16806

Resolve "Update Nokogiri to 1.8.2"

Closes #42591

See merge request gitlab-org/gitlab-ce!16807

Migrate Git::Repository#write_ref to Gitaly

Closes gitaly#784

See merge request gitlab-org/gitlab-ce!16513

Login via OAuth marked as "external" should only mark new users as "external", not existing ones

Closes #21554

See merge request gitlab-org/gitlab-ce!16672

Merge branch '42160-error-500-loading-merge-request-undefined-method-index-for-nil-nilclass' into 'master'

Resolve "Error 500 loading merge request: undefined method `index' for nil:NilClass"

Closes #42160

See merge request gitlab-org/gitlab-ce!16795

Speed-up the click on 'New subgroup' if the 'No results' text is shown

See merge request gitlab-org/gitlab-ce!16803

Define QA selectors and remove EE only code

Closes gitlab-qa#154

See merge request gitlab-org/gitlab-ce!16767

Signed-off-by: Rémy Coutable <remy@rymai.me>

The conflicts are simple enought to resolve that we don't need to bother
developers with those.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Decouple more of Repository from Rugged

Closes gitaly#969

See merge request gitlab-org/gitlab-ce!16763

Closes gitaly#958

Signed-off-by: Rémy Coutable <remy@rymai.me>

Make pagination optional for issuables

See merge request gitlab-org/gitlab-ce!16774

Check MR state before submitting queries for discussion state

Closes #42236

See merge request gitlab-org/gitlab-ce!16788

It appears that some legacy diff notes on GitLab.com have invalid line codes,
which means truncated_diff_lines won't work. This is just a band-aid solution,
as neither the diff nor the discussion will display correctly for these notes,
but they won't cause a 500 error.

# Conflicts:
#   qa/qa/page/group/show.rb

Port changes from gitlab-org/gitlab-ee!4064 to CE

See merge request gitlab-org/gitlab-ce!16796

On epics roadmap page we list all epics in the given time frame
without pagination (at least for the first iteration), in this
case it would be nice to use the existing issuables index logic
except pagination (see MR gitlab-ee!4281). For this reason this
patch allows to easily disable pagination.

Related gitlab-ee!4281

Don't run scripts/lint-changelog-yaml in scripts/static-analysis but only in the 'docs lint' job

Closes #42569

See merge request gitlab-org/gitlab-ce!16790

More $.ajax conversions to axios

See merge request gitlab-org/gitlab-ce!16761

Add `createNewItemFromValue` option and `clearDropdown` method to `create_item_dropdown`

See merge request gitlab-org/gitlab-ce!16699

Signed-off-by: Rémy Coutable <remy@rymai.me>

Replace $.get in single file diff with axios

See merge request gitlab-org/gitlab-ce!16696

Replace $.post in label manager with axios

See merge request gitlab-org/gitlab-ce!16695

doc: Correct example responses in repository_files.md

See merge request gitlab-org/gitlab-ce!16754

Update index.md

See merge request gitlab-org/gitlab-ce!16733