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 

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

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