[ci-skip] add the CE changelog and remove the EE changelogs

changelogs/unreleased-ee/39118-dynamic-pipeline-variables-fe.yml

----
-title: Update CI/CD secret variables list to be dynamic and save without reloading
-  the page
-merge_request: 4110
-author:
-type: added

changelogs/unreleased-ee/4163-move-uploads-to-object-storage.yml

----
-title: Add object storage support for uploads.
-merge_request: 3867
-author:
-type: added

changelogs/unreleased-ee/4378-fix-cluster-js-not-running-on-update-page.yml

----
-title: Fix JavaScript bundle running on Cluster update/destroy pages
-merge_request:
-author:
-type: fixed

changelogs/unreleased-ee/4915-background-upload-option-is-not-effective.yml

----
-title: Fix the background_upload configuration being ignored.
-merge_request: 4507
-author:
-type: fixed

changelogs/unreleased-ee/allow-to-store-artifacts-on-object-storage.yml

----
-title: Allow to Store Artifacts on Object Storage
-merge_request:
-author:

changelogs/unreleased-ee/bvl-external-policy-classification.yml

----
-title: Authorize project access with an external service
-merge_request: 4675
-author:
-type: added

changelogs/unreleased-ee/jej-lfs-object-storage.yml

----
-title: LFS files can be stored in remote object storage such as S3
-merge_request: 2760
-author:
-type: added

changelogs/unreleased-ee/use-send-url-for-incompatible-runners.yml

----
-title: Support SendURL for performing indirect download of artifacts if clients does
-  not specify that it supports that
-merge_request:
-author:
-type: fixed

changelogs/unreleased-ee/zj-auto-upload-job-artifacts.yml

----
-title: Transfer job archives to object storage after creation
-merge_request:
-author:
-type: added

changelogs/unreleased-ee/zj-improve-object-store-rake-task.yml

----
-title: Use a logger for the artifacts migration rake task
-merge_request:
-author:
-type: changed

changelogs/unreleased/40781-os-to-ce.yml

+---
+title: Add object storage support for LFS objects, CI artifacts, and uploads.
+merge_request: 17358
+author:
+type: added