Do not deactivate ghost layer update when item family network is present.

[stdcm]

• ItemFamilyNetwork is present when graph activated
• Only use of item families dependencies in synchronization doesn't need ghost update

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.56%. Comparing base (ebe8a25) to head (4b282b7).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
arcane/src/arcane/mesh/DynamicMesh.cc	0.00%	0 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1998   +/-   ##
=======================================
  Coverage   70.56%   70.56%           
=======================================
  Files        2291     2291           
  Lines      167594   167594           
  Branches    19314    19314           
=======================================
+ Hits       118260   118263    +3     
+ Misses      42242    42240    -2     
+ Partials     7092     7091    -1     

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