[otlpexporter] Validate the configuration explicitly (#9523) #2

Job	Run time
contrib-tests-matrix (receiver-0)	5m 0s
contrib-tests-matrix (receiver-1)	6m 58s
contrib-tests-matrix (receiver-2)	8m 32s
contrib-tests-matrix (receiver-3)	6m 20s
contrib-tests-matrix (processor)	4m 29s
contrib-tests-matrix (exporter-0)	8m 46s
contrib-tests-matrix (exporter-1)	7m 28s
contrib-tests-matrix (extension)	5m 9s
contrib-tests-matrix (connector)	3m 18s
contrib-tests-matrix (internal)	5m 19s
contrib-tests-matrix (pkg)	3m 2s
contrib-tests-matrix (cmd-0)	7m 19s
contrib-tests-matrix (cmd-1)	3m 52s
contrib-tests-matrix (other)	8m 38s
contrib_tests	1s
	1h 24m 11s

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