core, repair: migrate tests to non-overlapping ports

[puhtaytow]

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 PR is the step in the journey toward resolving the issue.

Related to #7055

Summary of Changes

• Fixed bug with inclusive end port in test_request_repair_for_shred_from_address
• Migrated instances across core, repair tests that had in place obsolete bind_to_unspecified

[0xbrw]

thank you keeping the PRs small and easy to review! we'll have @alexpyattaev or @KirillLykov take a look when they get a chance

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (86d14f6) to head (776f857).
⚠️ Report is 29 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7141   +/-   ##
=======================================
  Coverage    83.2%    83.2%           
=======================================
  Files         853      853           
  Lines      373926   373929    +3     
=======================================
+ Hits       311358   311422   +64     
+ Misses      62568    62507   -61     

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[puhtaytow]

thank you keeping the PRs small and easy to review! we'll have @alexpyattaev or @KirillLykov take a look when they get a chance

thank you 🙏

[alexpyattaev]

lgtm