refactor: discovery response improvements #15747

Job	Run time
Javadoc	2m 42s
API-Tests	2m 42s
Tck-Tests	2m 42s
Verify-OpenApi / prepare-api-groups	2m 43s
Component-Tests	2m 42s
Postgresql-Integration-Tests	2m 41s
Unit-Tests	2m 31s
Checkstyle	2m 43s
End-To-End-Tests	2m 43s
CodeQL / Analyze (java)	2m 45s
Verify-OpenApi / verify-spec	1s
	26m 55s

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