fix: build service worker without writing it to FS #20306

Job	Run time
build	2m 36s
unit-tests (1, flow-client,flow-server,vaadin-dev-server,flow-data,flow-bom,flow-polymer-template...	6s
it-tests (1, flow-tests/test-embedding/test-embedding-application-theme,flow-tests/test-npm-only-...	7s
it-tests (2, flow-tests/test-frontend/vite-basics,flow-tests/test-embedding/test-embedding-produc...	5s
it-tests (3, flow-tests/test-live-reload,flow-tests/test-embedding/test-embedding-generic,flow-te...	7s
it-tests (4, flow-tests/vaadin-spring-tests/test-spring-boot-only-prepare,flow-tests/vaadin-sprin...	5s
it-tests (5, flow-tests/vaadin-spring-tests/test-spring,flow-tests/vaadin-spring-tests/test-sprin...	5s
it-tests (6, flow-tests/test-eager-bootstrap,flow-tests/test-router-custom-context,flow-tests/tes...	6s
it-tests (7, flow-tests/test-pwa-disabled-offline,flow-tests/test-custom-frontend-directory/test-...	6s
it-tests (8, flow-tests/test-frontend/vite-pwa,flow-tests/test-ccdm-flow-navigation,flow-tests/te...	6s
it-tests (9, flow-tests/test-frontend/vite-pwa-disabled-offline,flow-tests/test-frontend/vite-emb...	6s
it-tests (10, flow-tests/test-pwa,flow-tests/test-dev-mode,flow-tests/test-frontend/vite-embedded...	7s
it-tests (11, flow-tests/test-redeployment,flow-tests/test-frontend/vite-embedded-webcomponent-re...	6s
it-tests (12, flow-tests/test-root-context, AbstractClientServerCounterIT,AbstractDebounceSynchro...	8s
it-tests (13, flow-tests/test-root-context, AbstractBasicElementComponentIT,AbstractContextInline...	8s
test-results	1s
	4m 5s

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