Update CHANGELOG-EE.md for 13.12.0-ee

[ci skip]

ee/changelogs/unreleased/301082-fe-vsa-add-sorting-to-stage-tables.yml

----
-title: Add sorting to the VSA stage table
-merge_request: 60793
-author:
-type: added

ee/changelogs/unreleased/320809-geo-preflight-checks-blocked-by-repository-checked-status.yml

----
-title: Stop checking repository check status on Geo secondary
-merge_request: 60323
-author:
-type: fixed

ee/changelogs/unreleased/321419-new-policy-gets-rule-by-default.yml

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-title: New policy starts out with a rule by default
-merge_request: 60464
-author:
-type: changed

ee/changelogs/unreleased/321448-vsa-show-record-count-for-the-stage-fe.yml

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-title: Add stage count to group-level VSA
-merge_request: 60598
-author:
-type: added

ee/changelogs/unreleased/321573-vsa-use-single-stat-for-overview-metrics.yml

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-title: Replace metric card with GlSingleStat in VSA
-merge_request: 59732
-author:
-type: changed

ee/changelogs/unreleased/321785-deprecate-group-level-merge-request-analytics-metrics.yml

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-title: Mark 3 group-level Merge Request Analytics metrics as removed
-merge_request: 60175
-author:
-type: deprecated

ee/changelogs/unreleased/321918_validate_report_artifacts.yml

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-title: Introduce security report schema validation
-merge_request: 58667
-author:
-type: added

ee/changelogs/unreleased/322043-behave-trial-as-paid-plan.yml

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-title: Allow trial plans to behave paid plan
-merge_request: 60496
-author:
-type: added

ee/changelogs/unreleased/322043-hide-card-display.yml

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-title: Hide display of certain plans on billings page
-merge_request: 60137
-author:
-type: added

ee/changelogs/unreleased/322324-vulnerabilities-bulk-actions-animate.yml

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-title: Adds an expand/collapse transition when showing/hiding the bulk action section in the vulnerability lists.
-merge_request: 60944
-author:
-type: changed

ee/changelogs/unreleased/322784-avoid-joins-when-searching-mrs.yml

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-title: Don't use Elasticsearch join for group/project MR searches
-merge_request: 60249
-author:
-type: performance

ee/changelogs/unreleased/322786-denormalize-project-permissions-to-merge-request-in-elasticsearch.yml

----
-title: Denormalize project permissions to merge request in Elasticsearch
-merge_request: 59731
-author:
-type: changed

ee/changelogs/unreleased/322788-elasticsearch-migration-to-backfill-project-permissions-to-merg.yml

----
-title: Add Elasticsearch migration to backfill project permissions on MRs
-merge_request: 59836
-author:
-type: changed

ee/changelogs/unreleased/322788-speed-up-backfill-mr-permissions-elasticsearch-migration.yml

----
-title: Speed up Elastic AddNewDataToMergeRequestsDocuments migration
-merge_request: 60563
-author:
-type: changed

ee/changelogs/unreleased/322794-avoid-joins-for-global-elasticsearch-searches.yml

----
-title: Avoid use of Elasticsearch joins in Global Merge Request searches
-merge_request: 60467
-author:
-type: changed

ee/changelogs/unreleased/322800-es-migration-to-delete-merge-requests-from-combined-index.yml

----
-title: Delete Merge Requests from original ES index
-merge_request: 61394
-author:
-type: changed

ee/changelogs/unreleased/322889-move-vulnerability-report-alerts.yml

----
-title: Show scanner warning at the top of the Vulnerability Report
-merge_request: 60716
-author:
-type: changed

ee/changelogs/unreleased/323159-enable-group-level-devops-adoption.yml

----
-title: Enable group devops adoption by default
-merge_request: 60638
-author:
-type: added

ee/changelogs/unreleased/323181-hide-renew-button-for-trail-subscriptions.yml

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-title: Hide "Renew" button for trial subscription on group billing page
-merge_request: 55796
-author: Kev @KevSlashNull
-type: fixed

ee/changelogs/unreleased/323195-path-locks-graphql.yml

----
-title: Expose Path Locks in the GraphQL API
-merge_request: 61380
-author:
-type: added