Tests: use the non-overlapping socket bind API

[alexpyattaev]

Problem

• A bunch of tests still relies on either hardcoded ports or bind_to_localhost and bind_to_unspecified. This creates flaky tests in cases where unique port ranges are needed.
• This is especially noticable in tests such as gossip_ring flaking in CI, as they allocate a lot of ports in a fixed pattern.

Summary of Changes

• change to use localhost_port_range_for_tests in some of the places.
• More PRs like this to follow.

[brooksprumo]

I'm not familiar with these tests, so I'm going to bow out of reviewing. Thanks for taking a look!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (833b05b) to head (e8f6133).
⚠️ Report is 2946 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6886   +/-   ##
=======================================
  Coverage    83.2%    83.2%           
=======================================
  Files         852      852           
  Lines      376951   376959    +8     
=======================================
+ Hits       313888   313914   +26     
+ Misses      63063    63045   -18     

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[gregcusack]

lgtm! thank you!

[yihau]

🫡