refactor: remove beta sync script and update promotion documentation #11

Job	Run time
validate	2m 44s
reserve-version	5s
publish-docker (web, infra/docker/local/web/Dockerfile)	2m 21s
publish-docker (management-web-sidecar, infra/docker/local/management-web-sidecar/Dockerfile)	1m 40s
publish-docker (api, infra/docker/local/api/Dockerfile)	1m 43s
publish-docker (management-api, infra/docker/local/management-api/Dockerfile)	1m 47s
publish-docker (management-web, infra/docker/local/management-web/Dockerfile)	1m 58s
publish-docker (web-sidecar, infra/docker/local/web-sidecar/Dockerfile)	1m 55s
verify-published-tags	4s
github-prerelease-create	5s
workflow-summary	4s
	14m 26s

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