ENG-48179: Revert NewClient api usage in configgrpc. #1900

Job	Run time
contrib-tests-matrix (receiver-0)	28s
contrib-tests-matrix (receiver-1)	27s
contrib-tests-matrix (receiver-2)	23s
contrib-tests-matrix (receiver-3)	25s
contrib-tests-matrix (processor)	28s
contrib-tests-matrix (exporter-0)	27s
contrib-tests-matrix (exporter-1)	43s
contrib-tests-matrix (extension)	39s
contrib-tests-matrix (connector)	26s
contrib-tests-matrix (internal)	34s
contrib-tests-matrix (pkg)	28s
contrib-tests-matrix (cmd-0)	41s
contrib-tests-matrix (cmd-1)	43s
contrib-tests-matrix (other)	43s
contrib_tests	0s
	7m 35s

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