refactor(test): make `Participant` lazy (#4723) #442

Job	Run time
publish / generate-openapi-spec	3m 34s
publish / generate-swagger-ui (control-api)	2m 0s
publish / generate-swagger-ui (dsp-api)	1m 53s
publish / generate-swagger-ui (management-api)	1m 56s
publish / generate-swagger-ui (observability-api)	1m 57s
publish / generate-swagger-ui (public-api)	2m 7s
publish / generate-swagger-ui (sts-accounts-api)	1m 54s
publish / generate-swagger-ui (sts-api)	2m 8s
publish / generate-swagger-ui (version-api)	2m 7s
publish / deploy-swagger-ui	5s
	19m 41s

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