Update CHANGELOG-EE.md for 13.9.0-ee

CHANGELOG-EE.md

...leased/10687-track-load-performance-widget-expansions.yml

...released/13843-regularly-reverify-packages-on-primary.yml

...he-average-code-coverage-of-all-of-a-group-s-projects.yml

...t-be-changed-for-users-not-meeting-domain-restriction.yml

...released/221066-usage-ping-code-coverage-project-link.yml

...nreleased/229389-mr-analytics-add-mttm-container-fe-2.yml

.../unreleased/229389-mr-analytics-add-mttm-container-fe.yml

...utton-in-epic-list-should-direct-the-user-to-a-full-e.yml

ee/changelogs/unreleased/231170-path-lock-button.yml

...hangelogs/unreleased/233434-cablett-create_epic_board.yml

...logs/unreleased/233598-health-status-sidebar-dropdown.yml

ee/changelogs/unreleased/238884-epic-error-messages.yml

...rch-reindexing-should-restore-the-original-refresh_in.yml

...angelogs/unreleased/259255-Create-activity-filter-new.yml

...gs/unreleased/260419-add-group-webhooks-for-subgroups.yml

...released/267521-add-blobPath-to-vulnerabilitylocation.yml

...project-security-status-list-is-not-centred-correctly.yml

...sed/271523-mlunoe-display-eoa-banner-on-billing-pages.yml

...be-add-info-error-messages-to-security-widget-summary.yml