Fixed error with GFM autocomplete when no data exists

See merge request !8288

Fix line breaking in nodes of the pipeline graph in firefox

Closes #26026

See merge request !8292

fixes confidential warning alignment on comment box

Closes #26038

See merge request !8293

In issue view, remove checking branches state

See merge request !8023

Replace wording for slash command confirmation message

See merge request !8123

UX Guide: add comment and discussion to copy

See merge request !8206

Add more storage statistics

See merge request !7754

Fix whitespace in codeblock

See merge request !8291

Revert "Merge branch 'fix-latest-pipeine-ordering' into 'master'"

See merge request !8302

This reverts merge request !8286

CSS fixes on Cycle Analytics page

See merge request !8300

Fixes text splitting into two lines

[ci skip]

Fix text overflow

Closes #25930

See merge request !8273

Resolve "Mini pipeline graph dropdown looks weird on Safari and hover does not work on firefox"

Closes #26018, #26004, and #26002

See merge request !8282

Do not override incoming webhook channel for mattermost and slack

Closes #25887

See merge request !8270

Monkey-patch StrongParameters for ::UploadedFile

Closes gitlab-ee#1451

See merge request !8299

Improve spec for resetting incoming email token

Closes #25614

See merge request !8296

Improve ProcessCommitWorker for large push payloads

Closes #25827

See merge request !8267

Fix errorcode 500 on slash commands

Closes #26013

See merge request !8285

[ci skip] Fix wrong release date for 8.15.0 on CHANGELOG

See merge request !8294

When processing push payloads we now schedule at most the 100 most
recent commits, instead of all commits that were in a payload. This
prevents one from overloading the system by pushing thousands if not
millions of commits in a single go.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/25827

Adds MR ID to CHANGELOG entry

Fix code that selects latest pipelines

Closes #25993 and #26031

See merge request !8286

[ci skip]