refactor: save one iteration of the extension list in DependencyGraph… #12981

Job	Run time
Checkstyle	4m 45s
Unit-Tests	11m 11s
Javadoc	6m 42s
API-Tests	7m 58s
Component-Tests	12m 9s
End-To-End-Tests	15m 59s
Postgresql-Integration-Tests	8m 57s
Verify-OpenApi	0s
CodeQL / Analyze (java)	12m 11s
	1h 19m 52s

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