tapgarden: pre proof retrieval delay respects context done signal #1374

Job	Run time
cross compilation	12m 26s
Format check	41s
Docker build check	4m 9s
Compilation check	51s
run itests	7m 3s
run itests postgres	10m 34s
Lint check	2m 52s
go mod check	3m 6s
RPC check	2m 4s
Sqlc check	31s
run unit tests (unit-race)	6m 20s
run unit tests (unit-cover)	3m 58s
test vector check	2m 16s
run unit tests (unit dbbackend=postgres)	4m 40s
	1h 1m 31s

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