TCP discovery server tests

[jepemi]

A new test for TCP discovery server has been included (added to TEST_XFAIL.list until fixing related issues in FastDDS).

Additionally, DDSRouter's TCP tests have been removed from TEST_XFAIL.list.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.74%. Comparing base (29de75f) to head (0c011e1).
⚠️ Report is 61 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #440   +/-   ##
=======================================
  Coverage   30.74%   30.74%           
=======================================
  Files          16       16           
  Lines         553      553           
  Branches      291      291           
=======================================
  Hits          170      170           
  Misses        200      200           
  Partials      183      183           

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