Add `discardResponseMessage` option for gRPC client #3564

Job	Run time
test-current-cov (1.22.x, ubuntu-latest)	7m 13s
test-current-cov (1.22.x, windows-2019)	13m 55s
test-prev (1.21.x, ubuntu-latest)	1m 55s
test-tip (ubuntu-latest)	3m 59s
test-prev (1.21.x, windows-2019)	5m 34s
test-tip (windows-2019)	9m 42s
	42m 18s

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