build

Parallelize file uploads in fs cp command. #21695

Job	Run time
testmask	25s
cleanups	2s
validate-generated-is-up-to-date	46s
validate-python-codegen	13s
integration-trigger	12s
make test (linux, terraform)	7m 55s
make test (windows, terraform)	14m 16s
make test (linux, direct)	2m 27s
make test (windows, direct)	5m 13s
make test (macos, direct)	5m 48s
make test (macos, terraform)	13m 35s
make test-exp-ssh	0s
make test-pipelines	0s
make test-exp-aitools	0s
test-result	3s
	50m 55s

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