[scraperhelper] deprecate NewObsReport, ObsReport, ObsReportSettings #22184

Job	Run time
govulncheck	42s
setup-environment	9s
unittest-matrix (ubuntu-latest, ~1.23)	2m 23s
lint	3m 57s
unittest-matrix (ubuntu-latest, ~1.22)	2m 17s
checks	1m 50s
cross-build-collector (darwin, amd64)	40s
test-coverage	6m 22s
cross-build-collector (darwin, arm64)	43s
cross-build-collector (linux, 386)	41s
cross-build-collector (linux, amd64)	39s
cross-build-collector (linux, arm64)	44s
cross-build-collector (linux, ppc64le)	49s
cross-build-collector (linux, arm, 7)	38s
cross-build-collector (linux, s390x)	36s
cross-build-collector (windows, 386)	47s
cross-build-collector (windows, amd64)	42s
unittest	1s
	24m 40s

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