Add latest changes from gitlab-org/gitlab@master

changelogs/unreleased/29020-merge-requests-issues-links.yml

----
-title: Provide Merge requests and Issue links through the Release API
-merge_request: 18311
-author:
-type: added

changelogs/unreleased/29020-update-release-blocks-for-multiple-milestone-support.yml

----
-title: Add support for the association of multiple milestones to the Releases page
-merge_request: 17091
-author:
-type: changed

changelogs/unreleased/29215-500-error-when-deleting-group-web-hook-activerecord-statementinvali.yml

----
-title: Use cascading deletes for deleting logs upon deleting a webhook
-merge_request: 18642
-author:
-type: performance

changelogs/unreleased/29284-video-preview-not-working.yml

----
-title: Fix inline rendering of videos for uploads with uppercase file extensions
-merge_request: 17924
-author:
-type: fixed

changelogs/unreleased/29477-notification-settings-display-all-groups.yml

----
-title: Show all groups user belongs to in Notification settings
-merge_request: 17303
-author:
-type: fixed

changelogs/unreleased/29513-continue-improvements-for-time-window-filtering-on-metrics-dashboar.yml

----
-title: Improve time window filtering on metrics dashboard
-merge_request: 17554
-author:
-type: added

changelogs/unreleased/29835-webide-fork.yml

----
-title: Web IDE button should fork and open forked project when selected from read-only
-  project
-merge_request: 17672
-author:
-type: added

changelogs/unreleased/29881-fix-ide-delete-and-readd.yml

----
-title: Fix Web IDE tree not updating modified status
-merge_request: 18647
-author:
-type: fixed

changelogs/unreleased/30112-private-internal-sub-group-email-notifications-not-sent-when-mentio.yml

----
-title: Fix notifications for private group mentions in Notes, Issues, and Merge Requests
-merge_request: 18183
-author:
-type: fixed

changelogs/unreleased/30186-mirror-pull-api-no-unpause.yml

----
-title: Do not start mirroring via API when paused
-merge_request: 17930
-author:
-type: changed

changelogs/unreleased/30217-refactor-email-notification-code.yml

----
-title: Refactor email notification code
-merge_request: 17741
-author: briankabiro
-type: other

changelogs/unreleased/30392-variables.yml

----
-title: Fixes variables overflowing in sm screens
-merge_request:
-author:
-type: fixed

changelogs/unreleased/30497-race-condition-in-discussions-json-request-could-lead-to-notes-show.yml

----
-title: Fix notes race condition when linking to specific note
-merge_request: 17777
-author:
-type: fixed

changelogs/unreleased/30525-iframe_jaeger.yml

----
-title: Embed Jaeger in Gitlab UI
-merge_request:
-author:
-type: changed

changelogs/unreleased/30619-make-recent-searches-more-visible.yml

----
-title: Use text instead of icon for recent searches dropdown
-merge_request:
-author:
-type: changed

changelogs/unreleased/30807-fix-usability-problem.yml

----
-title: Fix usability problems with the file template picker
-merge_request: 17522
-author:
-type: changed

changelogs/unreleased/30839-asciidoc-table-styles.yml

----
-title: Enable grid, frame and stripes styling on AsciiDoc tables
-merge_request: 18165
-author: Guillaume Grossetie
-type: fixed

changelogs/unreleased/30877-optimize-explore-snippets.yml

----
-title: Show only personal snippets on explore page
-merge_request: 18092
-author:
-type: performance

changelogs/unreleased/30881-webide-mr-confirmation.yml

----
-title: 'Fix Issue: WebIDE asks for confirmation to leave the page when committing
-  and creating a new MR'
-merge_request: 17671
-author:
-type: fixed

changelogs/unreleased/31007-limit-activity-events.yml

----
-title: Aggregate push events when there are too many
-merge_request: 18239
-author:
-type: changed