Use IDoFFamily instead of DoFFamily in GraphDofs.

[stdcm]

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[codecov]

Codecov Report

Attention: Patch coverage is 67.85714% with 9 lines in your changes missing coverage. Please review.

Project coverage is 70.64%. Comparing base (1bfdcb7) to head (9f21395).
Report is 4 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
arcane/src/arcane/mesh/GraphDoFs.cc	62.50%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2025      +/-   ##
==========================================
- Coverage   70.64%   70.64%   -0.01%     
==========================================
  Files        2290     2290              
  Lines      167688   167683       -5     
  Branches    19312    19312              
==========================================
- Hits       118462   118458       -4     
  Misses      42145    42145              
+ Partials     7081     7080       -1     

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