cleanup async_std from network_helpers_sv2

[plebhash]

close #1402

as described in #1402 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.71%. Comparing base (3d22194) to head (0d00daa).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1433      +/-   ##
==========================================
- Coverage   17.96%   16.71%   -1.26%     
==========================================
  Files         167      155      -12     
  Lines       11926    11133     -793     
==========================================
- Hits         2143     1861     -282     
+ Misses       9783     9272     -511     

Flag	Coverage Δ
binary_codec_sv2-coverage	0.00% <ø> (ø)
binary_serde_sv2-coverage	3.40% <ø> (ø)
binary_sv2-coverage	5.11% <ø> (ø)
bip32_derivation-coverage	?
buffer_sv2-coverage	?
codec_sv2-coverage	0.01% <ø> (ø)
common_messages_sv2-coverage	0.12% <ø> (ø)
const_sv2-coverage	0.00% <ø> (ø)
error_handling-coverage	?
framing_sv2-coverage	0.27% <ø> (ø)
jd_client-coverage	0.42% <ø> (+0.03%)	⬆️
jd_server-coverage	9.02% <ø> (+1.22%)	⬆️
job_declaration_sv2-coverage	0.00% <ø> (ø)
key-utils-coverage	2.39% <ø> (ø)
mining-coverage	2.34% <ø> (+0.01%)	⬆️
mining_device-coverage	0.00% <ø> (ø)
mining_proxy_sv2-coverage	0.82% <ø> (+0.11%)	⬆️
noise_sv2-coverage	4.25% <ø> (ø)
pool_sv2-coverage	?
protocols	23.86% <ø> (ø)
roles	6.43% <ø> (+0.58%)	⬆️
roles_logic_sv2-coverage	8.70% <ø> (ø)
sv2_ffi-coverage	0.00% <ø> (ø)
template_distribution_sv2-coverage	0.00% <ø> (ø)
translator_sv2-coverage	9.53% <ø> (+0.78%)	⬆️
utils	?
v1-coverage	2.31% <ø> (ø)

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[Shourya742]

ACK. Few nits.