Update CHANGELOG.md for 10.4.0

[ci skip]

changelogs/unreleased/36958-enable-ordering-projects-subgroups-by-name.yml

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-title: Enable ordering of groups and their children by name
-merge_request:
-author:
-type: added

changelogs/unreleased/37843-ci-trace-ansi-colours-256-bold-have-no-css-due-wrongly-ansi2html-light-color-variant-conversion-feature.yml

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-title: Fix ANSI 256 bold colors in pipelines job output
-merge_request:
-author:
-type: fixed

changelogs/unreleased/38019-hide-runner-token.yml

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-title: Hide runner token in CI/CD settings page
-merge_request:
-author:
-type: added

changelogs/unreleased/38030-add-graph-value-to-hover.yml

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-title: Display graph values on hover within monitoring page
-merge_request: 16261
-author:
-type: changed

changelogs/unreleased/38145_ux_issues_in_system_info_page.yml

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-title: Fixes the wording of headers in system info page
-merge_request: 15802
-author: Gilbert Roulot
-type: fixed

changelogs/unreleased/38239-update-toggle-design.yml

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-title: Update feature toggle design to use icons and make it i18n friendly
-merge_request: 15904
-author:
-type: changed

changelogs/unreleased/38318-search-merge-requests-with-api.yml

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-title: Add optional search param for Merge Requests API
-merge_request:
-author:
-type: fixed

changelogs/unreleased/38541-cancel-alignment.yml

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-title: fix button alignment on MWPS component
-merge_request:
-author:
-type: fixed

changelogs/unreleased/38596-fix-backspace-visual-token-clearing.yml

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-title: Clears visual token on second backspace
-merge_request:
-author: Martin Wortschack
-type: fixed

changelogs/unreleased/38893-banzai-upload-filter-relative-urls.yml

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-title: Use relative URLs when linking to uploaded files
-merge_request: 15751
-author:
-type: other

changelogs/unreleased/39246-fork-and-import-jobs-should-only-be-marked-as-failed-when-the-number-of-retries-was-exhausted.yml

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-title: Only mark import and fork jobs as failed once all Sidekiq retries get exhausted
-merge_request: 15844
-author:
-type: changed

changelogs/unreleased/39298-list-of-avatars-2.yml

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-title: List of avatars should never show +1
-merge_request: 15972
-author: Jacopo Beschi @jacopo-beschi
-type: added

changelogs/unreleased/39608-comment-on-image-discussions-tab-alignment.yml

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-title: Update comment on image cursor and icons
-merge_request: 15760
-author:
-type: fixed

changelogs/unreleased/3968-protected-branch-is-not-set-for-default-branch-on-import.yml

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-title: Protected branch is now created for default branch on import
-merge_request: 16198
-author:
-type: fixed

changelogs/unreleased/39957-redirect-to-gpc-page-if-users-try-to-create-a-cluster-but-the-account-is-not-enabled.yml

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-title: Implement checking GCP project billing status in cluster creation form.
-merge_request: 15665
-author:
-type: changed

changelogs/unreleased/40031-include-assset_sync-gem.yml

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-title: Add assets_sync gem to Gemfile
-merge_request: 15734
-author:
-type: added

changelogs/unreleased/40040-decouple-multi-file-editor-from-file-list.yml

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-title: Adds the multi file editor as a new beta feature
-merge_request: 15430
-author: 
-type: feature

changelogs/unreleased/40063-markdown-editor-improvements.yml

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-title: Hide markdown toolbar in preview mode
-merge_request:
-author:
-type: changed

changelogs/unreleased/40190-fix-slash-commands-dropdown-description-mis-alignement-on-firefox.yml

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-title: "Fix slash commands dropdown description mis-alignment on Firefox"
-merge_request: 16125
-author: Maurizio De Santis
-type: fixed

changelogs/unreleased/40228-verify-integrity-of-repositories.yml

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-title: Fix gitlab-rake gitlab:import:repos import schedule
-merge_request: 15931
-author:
-type: fixed