Use ArcSwapOption instead of ArcSwap for interceptors

[wyfo]

ArcSwapOption is supposed to be more optimized than ArcSwap when there is no interceptor

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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 76.70455% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.92%. Comparing base (3c77c34) to head (4803b46).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
zenoh/src/net/primitives/mux.rs	64.86%	26 Missing ⚠️
zenoh/src/net/routing/dispatcher/face.rs	71.05%	11 Missing ⚠️
zenoh/src/net/routing/interceptor/mod.rs	81.25%	3 Missing ⚠️
zenoh/src/net/primitives/demux.rs	97.82%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2376   +/-   ##
=======================================
  Coverage   71.91%   71.92%           
=======================================
  Files         390      390           
  Lines       62764    62742   -22     
=======================================
- Hits        45139    45129   -10     
+ Misses      17625    17613   -12     

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