Merge branch 'new-resolvable-discussion' of gitlab.com:gitlab-org/gitlab-ce into new-resolvable-discussion

# Conflicts:
#	app/assets/javascripts/filtered_search/dropdown_hint.js
#	app/views/shared/issuable/_search_bar.html.haml

adds initial microsoft teams integration

See merge request !10412

Fixed rubocop failure for the add_two_factor_columns_migration

See merge request !10505

Merge branch 'new-resolvable-discussion' of gitlab.com:gitlab-org/gitlab-ce into new-resolvable-discussion

Add text to break up polling diagrams

See merge request !10508

Merge branch '2989-run-cicd-pipelines-on-a-schedule-idea1-basic-backend-implementation' into 'master'

Resolve "Run CI/CD pipelines on a schedule" - "Basic backend implementation"

See merge request !10133

Resolve "Deleting a user shouldn't delete associated records"

Closes #28695 and #30514

See merge request !10467

Show the test coverage if it is available

Closes #27911

See merge request !10381

Multi-level container registry images

Closes #17801

See merge request !10109

[ci skip]

Use config.toml to configure Gitaly

See merge request !10496

1. Have `MigrateToGhostUser` be a service rather than a mixed-in module, to keep
   things explicit. Specs testing the behavior of this class are moved into a
   separate service spec file.

2. Add a `user.reported_abuse_reports` association to make the
   `migrate_abuse_reports` method more consistent with the other `migrate_`
   methods.

Resolve "Add system note icons to profile page"

Closes #29128

See merge request !10387

Merge commit '46e4ed6b' into feature/multi-level-container-registry-images

* commit '46e4ed6b': (28 commits)
  Award emoji button smiley animation
  Introduced empty/error UX states to environments monitoring.
  Github import rake task
  Remove individual modal width styles
  Fix RuboCop for removing index
  Link to docs site for file in doc/
  Disable invalid service templates (again)
  Show CI status as Favicon on Pipelines, Job and MR pages
  STL file viewer
  Wait for the PDF to be loaded before doing anything
  remove unnecessary lease as cron job
  Search for opened MRs - include reopened  MRs
  ProjectsFinder should handle more options
  Clearly show who triggered the pipeline in email
  Make it possible to preview pipeline success/failed emails
  Add remove_concurrent_index to database helper
  Add more tests for subgroups feature
  Large features by the 1st, small ones by the 3rd
  Ask people to create EE MRs on the 7th
  fix project authorizations migration issue
  ...

Linking to edit file directly

Closes #28899

See merge request !10233

Recent search history for issues

Closes #27262

See merge request !10324

Optimise trace handling code to use streaming instead of full read

See merge request !10311

Support 2FA requirement per-group

See merge request !8763

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/27262

Use Gitaly for Environment#first_deployment_for

See merge request !10294

Include endpoint in metrics for ETag caching middleware

See merge request !10495