Remove deprecated func types from exporterhelper #28982

Job	Run time
govulncheck	40s
setup-environment	11s
checks	2m 17s
lint	4m 24s
test-coverage	7m 53s
cross-build-collector (aix, ppc64)	46s
unittest-matrix (ubuntu-latest, ~1.24)	2m 33s
cross-build-collector (darwin, amd64)	46s
unittest-matrix (ubuntu-latest, ~1.23)	2m 20s
cross-build-collector (darwin, arm64)	50s
cross-build-collector (linux, 386)	49s
cross-build-collector (linux, amd64)	44s
cross-build-collector (linux, arm64)	40s
cross-build-collector (linux, ppc64le)	50s
cross-build-collector (linux, arm, 7)	44s
cross-build-collector (linux, s390x)	48s
cross-build-collector (windows, 386)	41s
cross-build-collector (windows, amd64)	45s
unittest	1s
	28m 42s

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