chore: remove static methods from the quickstart domain model #41

Job	Run time
Basic checks	55s
Build and publish artifacts and plugins locally	2m 37s
Run sbt test	3m 57s
Run annotation processor tests	1m 40s
Check service docker image contents	40s
Maven samples (shopping-cart-quickstart, true)	42s
Maven samples (choreography-saga-quickstart, true)	54s
Maven samples (doc-snippets, false)	27s
Maven samples (view-store, true)	1m 15s
Maven samples (spring-dependency-injection, true)	41s
Maven samples (event-sourced-customer-registry, true)	48s
Maven samples (event-sourced-counter-brokers, docker compose up -d, true)	1m 28s
Maven samples (event-sourced-customer-registry-subscriber, true, ./start-upstream.sh)	1m 3s
Maven samples (key-value-counter, true)	44s
Maven samples (key-value-shopping-cart, true)	44s
Maven samples (key-value-customer-registry, true)	54s
Maven samples (tracing, false)	33s
Maven samples (reliable-timers, true)	41s
Maven samples (transfer-workflow, true)	1m 0s
Maven samples (transfer-workflow-compensation, true)	1m 0s
	22m 43s

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