Rename MultiArray2SmallSpan to JaggedSmallSpan

[grospelliergilles]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.55%. Comparing base (bc9f4c5) to head (eccafc7).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
arcane/src/arcane/utils/MultiArray2.h	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1993      +/-   ##
==========================================
- Coverage   70.55%   70.55%   -0.01%     
==========================================
  Files        2291     2291              
  Lines      167618   167618              
  Branches    19314    19314              
==========================================
- Hits       118262   118261       -1     
  Misses      42265    42265              
- Partials     7091     7092       +1     

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