chore: gate codeql and trivy steps behind ENABLE_CODE_SCANNING var #130

Job	Run time
build (data-manager, ., services/data-manager/Dockerfile)	8m 2s
build (transitous-tools, services/motis/tools/transitous, services/motis/tools/transitous/Dockerf...	11m 48s
build (api, ., apps/api/Dockerfile)	17m 58s
build (web, ., apps/web/Dockerfile)	23m 27s
	1h 1m 15s

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