Tests: Squelch macOS accept incoming network connections notifications

[michaeldiamant]

Running unit tests on macOS results in several firewall-related accept/deny prompts asking: Do you want the application X to accept incoming network connections? The PR prevents these pop-ups by applying https://apple.stackexchange.com/a/405967 to affected tests.

[codecov]

Codecov Report

Merging #4814 (0c08992) into master (5b45539) will decrease coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4814      +/-   ##
==========================================
- Coverage   54.62%   54.25%   -0.37%     
==========================================
  Files         417      417              
  Lines       53734    53734              
==========================================
- Hits        29351    29156     -195     
- Misses      21946    22142     +196     
+ Partials     2437     2436       -1     

Impacted Files	Coverage Δ
catchup/ledgerFetcher.go	13.48% <0.00%> (-25.85%)	⬇️
data/transactions/verify/txn.go	51.15% <0.00%> (-23.97%)	⬇️
tools/network/resolver.go	22.22% <0.00%> (-18.52%)	⬇️
util/codecs/json.go	0.00% <0.00%> (-9.81%)	⬇️
data/transactions/logic/frames.go	93.44% <0.00%> (-6.56%)	⬇️
catchup/catchpointService.go	1.74% <0.00%> (-5.99%)	⬇️
data/transactions/verify/verifiedTxnCache.go	73.46% <0.00%> (-4.09%)	⬇️
data/basics/units.go	56.00% <0.00%> (-4.00%)	⬇️
network/phonebook.go	79.61% <0.00%> (-3.89%)	⬇️
catchup/universalFetcher.go	92.45% <0.00%> (-3.78%)	⬇️
... and 16 more

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[jannotti]

Amazing