Resolve N+1 query issue with discussions

Closes #33013

See merge request !11775

Add GitLab Resources to University

See merge request !11832

Introduce source to pipeline entity

See merge request !11682

This reverts commit 0d55def4.

This change continues with the plan to change the parameters passed
around GitLab components to allow for independence of mount points. See
https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/130#note_28747613

# Conflicts:
#   db/schema.rb

Add feature toggles through Flipper

See merge request !11747

Make .gitmodules parsing more resilient to syntax errors

Closes #26009

See merge request !11803

Rename BuildsController to JobsController

Closes #30699

See merge request !11407

Add Documentation for GIT_CHECKOUT variable

See merge request !11748

Update task_list to version 2.0.0

Closes #22470

See merge request !11525

Issue inline editing

Closes #24873

See merge request !11322

Fixed the show_user_callout method

See merge request !11689

Ui improvements for count badges and permission badges

See merge request !11805

* upstream/master: (63 commits)
  Update docs related to protected actions
  Add changelog for protected branches abilities fix
  Ask for an example project for bug reports
  Center loading spinner in issuable filters
  Fix chat commands specs related to protected actions
  Fix builds controller specs related to protected actions
  Fix pipeline retry specs related to protected actions
  Fix environment model specs related to protected actions
  Fix build factory specs related to protected actions
  Fix job play service specs related to protected actions
  Fix play status specs related to protected actions
  Fix deploy chat command specs for protected actions
  Fix environment specs related to protected actions
  Fix pipeline processing specs related to protected actions
  Fix build entity specs related to protected actions
  Check only a merge ability for protected actions
  Add tag_list param to project api
  Allow PostReceivePack to be enabled with Gitaly
  Remove some deprecated methods
  Add :owned param to ProjectFinder
  ...

Improve /project API performance

Closes #31855 and #31937

See merge request !11666

Center loading spinner in issuable filters

Closes #33137

See merge request !11818

Check only a merge ability for protected actions

Closes #32618

See merge request !11648

Ask for an example project for bug reports

See merge request !11819

Add tag_list param to project api

Closes #33000

See merge request !11799

Add API support for pipeline schedule

Closes #30892

See merge request !11307

Allow PostReceivePack to be enabled with Gitaly

Closes gitaly#246

See merge request !11809

* Bugs reported in the GitLab Issue trackers should be reproducible
* Asking reporters to reproduce on GitLab.com is reasonable
  * It lets us know whether the issue still exists in latest
  * It ensures that the steps to reproduce are solid
  * It gives Developers a live example to work from
  * Reporter can verify the fix in the example project once shipped

[skip ci]

* upstream/master: (116 commits)
  Revert "Merge branch 'grpc-1.3.4' into 'master'"
  Return nil when looking up config for unknown LDAP provider
  Avoid crash when trying to parse string with invalid UTF-8 sequence
  Enable Gitaly by default in GitLab 9.3
  Don’t create comment on JIRA if link already exists
  Disable sub_group_issuables_spec.rb for mysql
  Fix math rendering on blob pages
  Add changelog
  Don't allow to pass a user to ProjectWiki#http_url_to_repo
  Revert "Merge branch '1937-https-clone-url-username' into 'master'"
  Fix bottom padding for build page
  Fix /unsubscribe slash command creating extra todos
  Fix omniauth-google-oauth2 dependencies in Gemfile.lock
  Update looks job log
  'New issue'/'New merge request' dropdowns should show only projects with issues/merge requests feature enabled
  Fix spec for Members::AuthorizedDestroyService
  31616-add-uptime-of-gitlab-instance-in-admin-area
  Set head pipeline when creating merge requests
  Create a separate helper to check if we show particular tab on a search page
  Add performance deltas between app deployments on Merge Request widget
  ...

Return nil when looking up config for unknown LDAP provider

Closes #29342

See merge request !11804

Revert "Merge branch 'grpc-1.3.4' into 'master'"

See merge request !11813