remove unused filter processor #11952

Job	Run time
setup-environment	42s
lint	8m 47s
generate-metrics	4m 18s
gofmt	4m 18s
coverage	8m 0s
cross-compile (binaries-darwin_amd64)	4m 45s
test	14m 2s
tidy	1m 8s
cross-compile (binaries-darwin_arm64)	4m 23s
cross-compile (binaries-linux_amd64)	4m 27s
cross-compile (binaries-linux_arm64)	4m 25s
cross-compile (binaries-windows_amd64)	4m 29s
cross-compile (binaries-linux_ppc64le)	4m 24s
	1h 8m 8s

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