Update CHANGELOG-EE.md for 12.3.0-ee

CHANGELOG-EE.md

...nreleased/10395-require-code-owner-approval-on-pushes.yml

...-information-to-the-dependency-list-based-on-current-.yml

...elogs/unreleased/10586-geo-object-storage-replication.yml

...actions-on-epic-doesn-t-include-ancestor-group-labels.yml

ee/changelogs/unreleased/10943-css-clean-up.yml

...tate-region-component-for-design-management-empty-sta.yml

ee/changelogs/unreleased/11877-public-approval-api.yml

...ngelogs/unreleased/12055-public-mr-approval-rules-api.yml

...hangelogs/unreleased/12079-productivity-analytics-mvp.yml

...ines-minutes-expiry-banner-to-an-alert-component-type.yml

...ssions-for-dependency-list-project-sidebar-visibility.yml

...9-can-t-assign-group-milestone-to-project-issue-board.yml

...ased/12593-Convert-issue-analytics-chart-into-ECharts.yml

ee/changelogs/unreleased/12713-vulnerabilities-to-dl-api.yml

...hangelogs/unreleased/12775-hide-issue-boards-switcher.yml

...leased/12777-pressing-escape-should-close-the-designs.yml

...date-security-dashboard-layout-for-improved-usability.yml

...pport-restricting-group-access-by-multiple-ip-subnets.yml

...sed/12874-extend-group-ip-restriction-to-command-line.yml