fix(webapi): Set correct swagger return type for transmission list #2704

Job	Run time
Generate git short sha / Generate git short sha	4s
Check for changes / Filter	7s
Get current version / Filter	2s
build-infrastructure	0s
build / build-and-test	1m 26s
Dry run deploy infrastructure	0s
Dry run deploy apps / Deploy migration job to ${{ inputs.environment }}	0s
Dry run deploy apps / Deploy web-api-eu to test	41s
Dry run deploy apps / Deploy web-api-so to test	41s
Dry run deploy apps / Deploy graphql to test	1m 2s
Dry run deploy apps / Deploy service to test	1m 5s
Dry run deploy apps / Deploy job sync-subject-resource-mappings-job to test	41s
Dry run deploy apps / Deploy job sync-resource-policy-information-job to test	43s
Delete GitHub deployments / Delete GitHub deployments	2s
	6m 34s

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