network: don't listen if IncomingConnectionsLimit == 0

[cce]

Summary

While reviewing #6554 I thought it was strange that both WS and P2P network implementations still listen for connections when the incoming connection limit is set to 0, so made this small PR.

Test Plan

Two new tests added

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.73%. Comparing base (791c5ae) to head (e25f4d6).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (791c5ae) and HEAD (e25f4d6). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (791c5ae)	HEAD (e25f4d6)
full_coverage	4	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6568       +/-   ##
===========================================
- Coverage   63.66%   47.73%   -15.93%     
===========================================
  Files         484      645      +161     
  Lines       67688    87975    +20287     
===========================================
- Hits        43095    41997     -1098     
- Misses      21077    43217    +22140     
+ Partials     3516     2761      -755     

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