Avoid creating ObjectMapper but using JsonSerialization utility class… #1393

Job	Run time
Check conditional workflows and jobs	6s
UI Shared	1m 4s
Build Keycloak	6m 16s
Admin Client	1m 10s
Account UI	1m 7s
Admin UI	2m 12s
Generate Test Seed	1s
Account UI E2E	2m 8s
Admin UI E2E (1, chrome)	7m 40s
Admin UI E2E (2, chrome)	7m 0s
Admin UI E2E (3, chrome)	10m 51s
Admin UI E2E (4, chrome)	8m 35s
Admin UI E2E (5, chrome)	7m 30s
Status Check - Keycloak JavaScript CI	4s
	55m 44s

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