Add 2025-03-26 OAuth backward compatibility for client conformance #2298

Job	Run time
build (windows-latest, Debug)	12m 54s
build (windows-latest, Release)	11m 34s
build (macos-latest, Debug)	9m 43s
build (macos-latest, Release)	7m 33s
build (ubuntu-latest, Release)	7m 3s
build (ubuntu-latest, Debug)	6m 54s
publish-coverage / publish-coverage	1m 10s
	56m 51s

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