Deprecate AddScraper and introduce more explicit AddMetricsScraper #32328

Job	Run time
windows-service-test (windows-2025)	3m 14s
windows-service-test (windows-11-arm)	3m 25s
windows-unittest (windows-2025)	17m 22s
windows-unittest (windows-11-arm)	11m 21s
windows-unittest (windows-2022)	16m 18s
windows-service-test (windows-2022)	3m 26s
	55m 6s

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