[config] Deprecate component.UnmarshalConfig #19896

Job	Run time
setup-environment	10s
govulncheck	25s
test-coverage	5m 40s
lint	3m 13s
checks	2m 30s
cross-build-collector (darwin, amd64)	44s
unittest-matrix (ubuntu-latest, ~1.22)	2m 20s
cross-build-collector (darwin, arm64)	36s
unittest-matrix (ubuntu-latest, ~1.21.10)	2m 30s
cross-build-collector (linux, 386)	53s
cross-build-collector (linux, amd64)	37s
cross-build-collector (linux, arm64)	1m 5s
cross-build-collector (linux, ppc64le)	43s
cross-build-collector (linux, arm, 7)	44s
cross-build-collector (linux, s390x)	38s
cross-build-collector (windows, 386)	55s
cross-build-collector (windows, amd64)	52s
unittest	1s
	24m 36s

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