cleanup `async_std` from `network_helpers_sv2` #1552

Job	Run time
interop-jd-translator	1m 45s
interop-proxy-with-multi-ups	54s
interop-proxy-with-multi-ups-extended	57s
jds-do-not-fail-on-wrong-tsdatasucc	55s
jds-do-not-stackoverflow-when-no-token	1m 5s
jds-receive-solution-while-processing-declared-job	3m 24s
pool-sri-test-1-standard	3m 26s
pool-sri-test-close-channel	2m 7s
pool-sri-test-extended_1	3m 19s
pool-sri-test-extended_0	3m 23s
pool-sri-test-reject-auth	3m 22s
sv1-test	2m 38s
translation-proxy-broke-pool	2m 12s
translation-proxy-old-share	2m 15s
Aggregate MG Test Results	1s
	31m 43s

Provide feedback