gRPC: allow cancellation of downloads (#2609) #4510

Job	Run time
run-determination	1s
package-name-prefix	1s
Create artifact Windows_X86-32	1m 12s
Create artifact Windows_X86-64	1m 11s
Create artifact Linux_X86-32	1m 7s
Create artifact Linux_X86-64	1m 16s
Create artifact Linux_ARMv6	58s
Create artifact Linux_ARMv7	1m 0s
Create artifact Linux_ARM64	59s
Create artifact macOS_64	1m 37s
Create artifact macOS_ARM64	1m 53s
Create artifact rpc-protocol-files	13s
Create artifact configuration-schema	15s
checksums	8s
	11m 51s

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