v1.17: exits send_requests_task if the connection is closed (backport… #2

Job	Run time
cargo-test-sbf (token/program)	10m 12s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 50s
test	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 58s
cargo-test-sbf (token-upgrade/program)	10m 8s
cargo-test-sbf (feature-proposal/program)	10m 40s
check	0s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 41s
cargo-test-sbf (memo/program)	10m 5s
cargo-test-sbf (name-service/program)	10m 7s
cargo-test-sbf (stake-pool/program)	14m 6s
cargo-test-sbf (single-pool/program)	10m 43s
	1h 57m 30s

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