Simplify school entity mapping #15149

Job	Run time
branch_meta	2s
build_and_push	4m 56s
trivy-vulnerability-scanning	53s
deploy / create_artifacts_repos (schulcloud-server)	55s
deploy / create_artifacts_repos (schulcloud-client)	16s
end-to-end-tests / e2e (courses_and_topics)	5m 34s
end-to-end-tests / e2e (management)	5m 35s
deploy / create_artifacts_repos (nuxt-client)	25s
end-to-end-tests / e2e (navi_user_settings)	5m 33s
end-to-end-tests / e2e (tasks_and_other)	5m 16s
deploy / create_artifacts_repos (superhero-dashboard)	5s
deploy / create_artifacts_repos (schulcloud-calendar)	6s
deploy / create_artifacts_repos (antivirus_check_service)	7s
deploy / create_artifacts_repos (version-aggregator)	4s
deploy / create_artifacts_repos (dof_app_deploy)	4s
deploy / create_artifacts_repos (h5p-staticfiles-server)	6s
deploy / create_branch_identifier / convert_branch_name	1s
deploy / create_artifacts_workspaces (brb)	4s
deploy / create_artifacts_workspaces (default)	2s
deploy / create_artifacts_workspaces (nbc)	2s
deploy / create_artifacts_workspaces (thr)	3s
deploy / bingo_add_branch / get_values_insert_branch_if_not_existent	5s
deploy / deploy_nbc_dev / deploy nbc	8m 8s
deploy / deploy_brb_dev / deploy brb	7m 36s
deploy / deploy_dbc_dev / deploy dbc	7m 34s
test-successful	0s
deploy-successful	1s
cy-e2e-tests / e2e-system-tests	5m 23s
cy-e2e-tests / configuring-loading-secrets-running-tests	0s
	58m 56s

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