Regions tests

[OlivierHecart]

---

🏷️ Label-Based Checklist

Based on the labels applied to this PR, please complete these additional requirements:

Labels: internal

🏠 Internal Change

This PR is marked as internal (not user-facing):

• No API changes - Public APIs unchanged
• No behavior changes - External behavior identical
• Refactoring/maintenance - Code improvements only
• Tests still pass - All existing tests pass without modification

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[codecov]

Codecov Report

❌ Patch coverage is 83.57182% with 597 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.64%. Comparing base (96a6e43) to head (7277cc0).
⚠️ Report is 35 commits behind head on regions.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
zenoh/src/net/routing/hat/broker/interests.rs	57.52%	110 Missing ⚠️
commons/zenoh-protocol/src/core/region.rs	50.00%	64 Missing ⚠️
zenoh/src/net/routing/dispatcher/tables.rs	32.22%	61 Missing ⚠️
zenoh/src/net/routing/hat/client/interests.rs	57.69%	55 Missing ⚠️
zenoh/src/net/routing/dispatcher/queries.rs	85.80%	46 Missing ⚠️
zenoh/src/net/routing/hat/broker/queries.rs	80.70%	44 Missing ⚠️
zenoh/src/net/routing/hat/client/token.rs	68.60%	27 Missing ⚠️
zenoh/src/net/routing/dispatcher/token.rs	81.74%	23 Missing ⚠️
zenoh/src/net/routing/hat/client/mod.rs	75.90%	20 Missing ⚠️
zenoh/src/net/routing/dispatcher/interests.rs	89.78%	19 Missing ⚠️
... and 26 more

Additional details and impacted files

@@             Coverage Diff             @@
##           regions    #2365      +/-   ##
===========================================
+ Coverage    71.96%   72.64%   +0.67%     
===========================================
  Files          390      395       +5     
  Lines        62769    58346    -4423     
===========================================
- Hits         45174    42384    -2790     
+ Misses       17595    15962    -1633     

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