This refactors the Markdown pipeline so it supports the rendering of
multiple documents that may belong to different projects. An example of
where this happens is when displaying the event feed of a group. In this
case we retrieve events for all projects in the group. Previously we
would group events per project and render these chunks separately, but
this would result in many SQL queries being executed. By extending the
Markdown pipeline to support this out of the box we can drastically
reduce the number of SQL queries.

To achieve this we introduce a new object to the pipeline:
Banzai::RenderContext. This object simply wraps two other objects: an
optional Project instance, and an optional User instance. On its own
this wouldn't be very helpful, but a RenderContext can also be used to
associate HTML documents with specific Project instances. This work is
done in Banzai::ObjectRenderer and allows us to reuse as many queries
(and results) as possible.

Reduce complexity of issuable finder query.

Closes #37125

See merge request gitlab-org/gitlab-ce!18219

Update Security Products jobs definitions

See merge request gitlab-org/gitlab-ce!18265

Revert "Merge branch 'improve-jobs-queuing-time-metric' into 'master'"

See merge request gitlab-org/gitlab-ce!18276

This reverts merge request !17730

Replace vue resource with axios for pipelines table

See merge request gitlab-org/gitlab-ce!18264

Document process for new Git features

See merge request gitlab-org/gitlab-ce!18230

Use Gitaly 0.95.0

See merge request gitlab-org/gitlab-ce!18256

Verify that deploy token has valid access when pulling container registry image

Closes #45148

See merge request gitlab-org/gitlab-ce!18260

Migrate features/project/project.feature to RSpec and reorganize several Project feature specs

See merge request gitlab-org/gitlab-ce!18223

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

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

[ci skip]

This removes the extra check for project-ids which is not needed at all.
This does not necessarily reduce execution time of the query, but
improves planning time by a few millseconds.

Closes #37125.

Expose the target commit ID through the tag API

See merge request gitlab-org/gitlab-ce!18248

Use Goldiloader for handling N+1 queries

See merge request gitlab-org/gitlab-ce!18217

Bump Ruby to 2.3.7 and git to 2.17.0 in CI image

See merge request gitlab-org/gitlab-ce!18244

Resolve "Cannot read property 'commit_path' of null"

Closes #44296

See merge request gitlab-org/gitlab-ce!18231

Use gitlab-shell 7.1.2

See merge request gitlab-org/gitlab-ce!18258

Update GitLab SVGs version

See merge request gitlab-org/gitlab-ce!18250

Goldiloader is great, but has several issues with has_many :through relations:

* https://github.com/salsify/goldiloader/issues/12
* https://github.com/salsify/goldiloader/issues/14
* https://github.com/salsify/goldiloader/issues/18

Rather than try to figure out which applies in each case, we should just do the
drudge work of manually disabling autoloading for all relations of this type. We
can always use regular preloading for specific cases, but this way we avoid
generating invalid queries through Goldiloader's magic.

[Rails5] Fix `can't modify frozen Array` errors

See merge request gitlab-org/gitlab-ce!18239

Goldiloader (https://github.com/salsify/goldiloader) can eager load
associations automatically. This removes the need for adding "includes"
calls in a variety of different places. This also comes with the added
benefit of not having to eager load data if it's not used.

Resolve "Group owner cannot enable/disable specific-runners which was registered in a project under a subgroup"

Closes #41981

See merge request gitlab-org/gitlab-ce!18009

Move BoardBlankState vue component

See merge request gitlab-org/gitlab-ce!17666

Make email handler clearer

Closes #37403

See merge request gitlab-org/gitlab-ce!17501

Move FindLicense RPC to OPT OUT status

See merge request gitlab-org/gitlab-ce!18228

[Rails5] Add `rails-controller-testing` gem

See merge request gitlab-org/gitlab-ce!18242

Fix undefined method `one?` when pushing to an existing merge request

Closes #45152

See merge request gitlab-org/gitlab-ce!18243