Add 'Undo mark all as done' to Todos

Closes #27114

See merge request !9890

Fixed duplicate pagination on explore#groups

Closes #29531

See merge request !9988

Restore unicode file name images for legacy img emojis

See merge request !9986

Remove remaining references to .es6 file extension in our config files and documentation

See merge request !9980

Added filter bar into add issues modal

See merge request !9856

Futher rename the CI variables

See merge request !9851

Closes #29531

Fix projects without repo and wiki

Closes #29542

See merge request !9956

Fixed issue with modal window including main search bars tokens

Clean up the events when the modal window is closed

Updated modal filter spec

This class returns the correct container the filtered search should be
run in

At the moment it doesn't allow for multiple to be used at once, need to
look at a way to fix this

[ci skip]

[ci skip]

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9956#note_25445832

Added the ability to 'Undo mark all as done' todos marked as complete with 'Mark all as done'
in the 'Todo' tab of the Todo dashboard.
The operation undos only the todo previously marked as done with the 'Mark al as done' button.

Fixed pipeline action tooltips being cut off

Closes #29314

See merge request !9960

Adds pipeline mini-graph to system information box in Commit View

Closes #28494

See merge request !9902

Fix reply by email by fixing config/mail_room.yml to be interpretable without ActiveSupport

See merge request !9979

Moved the gear settings dropdown in the group view to a tab

Closes #23304

See merge request !9882

Revert the AddNotifiedOfOwnActivityToUsers migration

See merge request !9973

Revert "Merge branch 'option-to-be-notified-of-own-activity' into 'master'

See merge request !9974

Add missing steps of Pages source installation

Closes #29372

[ci skip]

See merge request !9923

Add quick submit for snippet forms

Closes #27534

See merge request !9911

This reverts commit 5e966688, reversing
changes made to b35378a9.

Better priority sorting

Closes #28754

See merge request !9938

Revert "Merge branch 'google-protobuf-3.2.0.1' into 'master'"

See merge request !9971

prevent filtering Issues by multiple milestones, authors, or assignees

Closes #27174

See merge request !9406

Copy code as GFM from diffs, blobs and GFM code blocks

See merge request !9874