Update CHANGELOG.md for 10.4.0

[ci skip]

changelogs/unreleased/disable-pages-on-jobs.yml

----
-title: Use simple Next/Prev paging for jobs to avoid large count queries on arbitrarily
-  large sets of historical jobs
-merge_request:
-author:
-type: performance

changelogs/unreleased/dm-diff-note-for-line-performance.yml

----
-title: Improve performance of MR discussions on large diffs
-merge_request:
-author:
-type: performance

changelogs/unreleased/docs-add-why-do-i-get-signed-out-authentication-section.yml

----
-title: Add docs for why you might be signed out when using the Remember me token
-merge_request: 15756
-author:
-type: other

changelogs/unreleased/feature-40842-provide-oracles-webgate-cookies-to-jira-requests.yml

----
-title: Provide additional cookies to JIRA service requests to allow Oracle WebGates
-  Basic Auth
-merge_request:
-author: Stanislaw Wozniak
-type: changed

changelogs/unreleased/feature-api_runners_online.yml

----
-title: Add online and status attribute to runner api entity
-merge_request: 11750
-author:
-type: added

changelogs/unreleased/fix-abuse-reports-link-url.yml

----
-title: Fix abuse reports link url in admin area navbar
-merge_request: 16068
-author: megos
-type: fixed

changelogs/unreleased/fix-activity-inline-event-line-height.yml

----
-title: Fix activity inline event line height on mobile
-merge_request: 16121
-author: George Tsiolis
-type: fixed

changelogs/unreleased/fix-create-mr-from-issue-with-template.yml

----
-title: Execute quick actions (if present) when creating MR from issue
-merge_request: 15810
-author:
-type: fixed

changelogs/unreleased/fix-docs-help-shortcut.yml

----
-title: Fix shortcut links on help page
-merge_request:
-author:
-type: fixed

changelogs/unreleased/fix-gb-fix-import-export-restoring-associations.yml

----
-title: Fix missing references to pipeline objects when restoring project with import/export
-  feature
-merge_request: 16221
-author:
-type: fixed

changelogs/unreleased/fix-last-push-event-widget-layout.yml

----
-title: Last push event widget width for fixed layout
-merge_request: 15862
-author: George Tsiolis
-type: fixed

changelogs/unreleased/fix-move-2fa-disable-button.yml

----
-title: Move 2FA disable button
-merge_request: 16177
-author: George Tsiolis
-type: fixed

changelogs/unreleased/fix-onion-skin-reenter.yml

----
-title: Fix onion-skin re-entering state
-merge_request:
-author:
-type: fixed

changelogs/unreleased/fix-profile-settings-content-width.yml

----
-title: Adjust content width for User Settings, GPG Keys
-merge_request: 16093
-author: George Tsiolis
-type: fixed

changelogs/unreleased/fix-profile-settings-sidebar-heading.yml

----
-title: Keep typographic hierarchy in User Settings
-merge_request: 16090
-author: George Tsiolis
-type: fixed

changelogs/unreleased/fix-remove-unnecessary-sidebar-element-alignment.yml

----
-title: Remove unnecessary sidebar element realignment
-merge_request: 16159
-author: George Tsiolis
-type: fixed

changelogs/unreleased/fix_build_count_in_pipeline_success_maild.yml

----
-title: fix build count in pipeline success mail
-merge_request: 15827
-author: Christiaan Van den Poel
-type: fixed

changelogs/unreleased/fj-40053-error-500-members-list.yml

----
-title: Fixing error 500 when member exist but not the user
-merge_request: 15970
-author:
-type: fixed

changelogs/unreleased/fj-40279-normalize-ldap-dn-api.yml

----
-title: Normalizing Identity extern_uid when saving the record
-merge_request:
-author:
-type: fixed

changelogs/unreleased/fj-41477-fix-bug-wiki-last-version.yml

----
-title: Fixing bug when wiki last version
-merge_request: 16197
-author:
-type: fixed