Update CHANGELOG-EE.md for 13.9.0-ee

[ci skip]

ee/changelogs/unreleased/276380-track-event-as-store-action-instead.yml

----
-title: Track code quality view event only once tab is active
-merge_request: 52140
-author:
-type: fixed

ee/changelogs/unreleased/276944-reduce-lcp-to-2-5s-for-sourcecode_mr_list.yml

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-title: Resolve N+1 issue loading approval rules on the MR list
-merge_request: 52364
-author:
-type: performance

ee/changelogs/unreleased/280538-fix-approvals-widget-alignment.yml

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-title: Fix approvals widget alignment issues
-merge_request: 53213
-author:
-type: fixed

ee/changelogs/unreleased/281177_use_previous_license_term_for_historical_max_data.yml

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-title: Use previous license term for seat overage
-merge_request: 53878
-author:
-type: changed

ee/changelogs/unreleased/284004_admin_move_advanced_search_up.yml

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-title: Move Advanced Search Admin Settings to Top Level
-merge_request: 51026
-author:
-type: changed

ee/changelogs/unreleased/284473-issues-created-from-vulnerabilities-detail-page-missing-informa.yml

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-title: Properly populate descriptions in an issue created from a vulnerability
-merge_request: 52592
-author:
-type: fixed

ee/changelogs/unreleased/284677-api-fuzzing-empty-body-bug-fix.yml

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-title: Show Response fields for vulnerabilties sourced from DAST
-merge_request: 51948
-author:
-type: fixed

ee/changelogs/unreleased/284740-allow-issuescontroller-to-creating-an-issue-with-vulnerability-.yml

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-title: Add feedback creation in controller
-merge_request: 52141
-author:
-type: changed

ee/changelogs/unreleased/287697-remove-needs-from-license-scanning-job.yml

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-title: Start license_scanning job within its stage, and not when pipeline starts
-merge_request: 54234
-author:
-type: changed

ee/changelogs/unreleased/288804-clean-up-feature-flag.yml

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-title: Add manual renew button to billings page
-merge_request: 52652
-author:
-type: other

ee/changelogs/unreleased/290112_add_security_dashboard_access_level_into_project_features.yml

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-title: Implement "Security & Compliance" visibility settings
-merge_request: 52551
-author:
-type: added

ee/changelogs/unreleased/290761-add-details-to-vulnerability-graphql.yml

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-title: Add details to Vulnerability GraphQL
-merge_request: 49465
-author:
-type: added

ee/changelogs/unreleased/290823-allow-selecting-fields-for-requirements-export-be.yml

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-title: 'Allows fields selection when exporting Requirements with GraphQL'
-merge_request: 52706
-author:
-type: added

ee/changelogs/unreleased/292104-epic-select-migration.yml

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-title: 'Feat(EpicSelect): Migrate epic select to internal GitLab UI compoenent'
-merge_request: 52528
-author:
-type: changed

ee/changelogs/unreleased/293742-feature-flag-rollout-of-reviewer_approval_rules.yml

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-title: Remove reviewer_approval_rules feature flag
-merge_request: 53205
-author:
-type: removed

ee/changelogs/unreleased/294173-description-of-vulnerability-is-empty-in-graphql.yml

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-title: Properly populate description in an issue created from a vulnerability
-merge_request: 52619
-author:
-type: fixed

ee/changelogs/unreleased/295252-enable-dast-saved-scans-ff.yml

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-title: Add ability to save and manage DAST scans
-merge_request: 53942
-author:
-type: added

ee/changelogs/unreleased/296032_ignore_es_connection_exception.yml

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-title: Ignore connection error when changing the Elasticsearch Server URL
-merge_request: 52645
-author:
-type: fixed

ee/changelogs/unreleased/296179-change-empty-state-location.yml

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-title: Move empty state into the threat monitoring tabs
-merge_request: 51748
-author:
-type: changed

ee/changelogs/unreleased/296608_remove_target_name.yml

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-title: Remove target_name parameter from Elasticsearch rake tasks
-merge_request: 52958
-author:
-type: changed