chore: remove static methods from the quickstart domain model (#25) #54

Job	Run time
Build and publish artifacts and plugins locally	2m 18s
Basic checks	48s
Run annotation processor tests	1m 42s
Check service docker image contents	42s
Run sbt test	3m 51s
Maven samples (shopping-cart-quickstart, true)	58s
Maven samples (choreography-saga-quickstart, true)	53s
Maven samples (doc-snippets, false)	31s
Maven samples (view-store, true)	1m 33s
Maven samples (spring-dependency-injection, true)	46s
Maven samples (event-sourced-customer-registry, true)	52s
Maven samples (event-sourced-counter-brokers, docker compose up -d, true)	1m 53s
Maven samples (event-sourced-customer-registry-subscriber, true, ./start-upstream.sh)	1m 3s
Maven samples (key-value-counter, true)	43s
Maven samples (key-value-shopping-cart, true)	38s
Maven samples (key-value-customer-registry, true)	1m 11s
Maven samples (tracing, false)	28s
Maven samples (reliable-timers, true)	51s
Maven samples (transfer-workflow, true)	57s
Maven samples (transfer-workflow-compensation, true)	48s
	23m 26s

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