Update CHANGELOG.md for 8.17.0

[ci skip]

changelogs/unreleased/27013-regression-in-commit-title-bar.yml

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-title: Fix commit title bar and repository view copy clipboard button order on last commit in repository view
-merge_request:
-author:

changelogs/unreleased/27014-fix-pipeline-tooltip-wrapping.yml

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-title: Fix mini-pipeline stage tooltip text wrapping
-merge_request:
-author:

changelogs/unreleased/27021-line-numbers-now-in-copy-pasta-data.yml

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-title: Prevent copying of line numbers in parallel diff view
-merge_request: 8706
-author:

changelogs/unreleased/27178-update-builds-link-in-project-settings.yml

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-title: Updated builds info link on the project settings page
-merge_request:
-author: Ryan Harris

changelogs/unreleased/27240-make-progress-bars-consistent.yml

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-title: 27240 Make progress bars consistent
-merge_request:
-author:

changelogs/unreleased/27277-small-mini-pipeline-graph-glitch-upon-hover.yml

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-title: fixed small mini pipeline graph line glitch
-merge_request: 8804
-author:

changelogs/unreleased/27291-unify-mr-diff-file-buttons.yml

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-title: Unify MR diff file button style
-merge_request: 8874
-author:

changelogs/unreleased/27321-double-separator-line-in-edit-projects-settings.yml

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-title: Only render hr when user can't archive project.
-merge_request: !8917
-author:

changelogs/unreleased/27332-mini-pipeline-graph-with-many-stages-has-no-line-spacing-in-firefox-and-safari.yml

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-title: Fix pipeline graph vertical spacing in Firefox and Safari
-merge_request: 8886
-author:

changelogs/unreleased/27352-search-label-filter-header.yml

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-title: 27352-search-label-filter-header
-merge_request:
-author:

changelogs/unreleased/27395-reduce-group-activity-sql-queries-2.yml

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-title: Include :author, :project, and :target in Event.with_associations
-merge_request:
-author:

changelogs/unreleased/27395-reduce-group-activity-sql-queries.yml

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-title: Don't instantiate AR objects in Event.in_projects
-merge_request:
-author:

changelogs/unreleased/27484-environment-show-name.yml

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-title: Don't capitalize environment name in show page
-merge_request:
-author:

changelogs/unreleased/27488-fix-jwt-version.yml

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-title: Update and pin the `jwt` gem to ~> 1.5.6
-merge_request:
-author:

changelogs/unreleased/27494-environment-list-column-headers.yml

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-title: Edited the column header for the environments list from created to updated and added created to environments detail page colum header titles
-merge_request:
-author:

changelogs/unreleased/27602-fix-avatar-border-flicker-mention-dropdown.yml

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-title: Fixes flickering of avatar border in mention dropdown
-merge_request: 8950
-author:

changelogs/unreleased/27632_fix_mr_widget_url.yml

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-title: Fix MR widget url
-merge_request: 8989
-author:

changelogs/unreleased/27639-emoji-panel-under-the-side-panel-in-the-merge-request.yml

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-title: Layer award emoji dropdown over the right sidebar
-merge_request: 9004
-author:

changelogs/unreleased/27656-doc-ci-enable-ci.yml

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-title: Update doc for enabling or disabling GitLab CI
-merge_request: 8965
-author: Takuya Noguchi

changelogs/unreleased/27774-text-color-contrast-is-barely-readable-for-pipelines-visualization-graph-page-with-roboto-fonts.yml

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-title: Give ci status text on pipeline graph a better font-weight
-merge_request:
-author: