Use ansys.tools.common for example data download

[greschd]

• Use ansys.tools.common.example_download for downloading data from the ansys/example-data repository instead of directly downloading with urllib.
• The download is still wrapped in our own function to keep the enum-based interface for the example data.

Resolves #968

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.89%. Comparing base (ce6851d) to head (28b4b97).

Files with missing lines	Patch %	Lines
src/ansys/acp/core/extras/example_helpers.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #990      +/-   ##
==========================================
- Coverage   93.90%   93.89%   -0.01%     
==========================================
  Files         110      110              
  Lines        5902     5898       -4     
  Branches      332      332              
==========================================
- Hits         5542     5538       -4     
  Misses        354      354              
  Partials        6        6              

Flag	Coverage Δ
direct-launch	90.97% <33.33%> (-0.01%)	⬇️
minimum-deps	91.99% <33.33%> (-0.01%)	⬇️
python-3.11	93.06% <33.33%> (-0.01%)	⬇️
python-3.12	93.06% <33.33%> (-0.01%)	⬇️
python-3.13	93.06% <33.33%> (-0.01%)	⬇️
python-3.14	93.29% <33.33%> (-0.01%)	⬇️
server-2024R2SP5	89.52% <33.33%> (-0.01%)	⬇️
server-2025R1SP4	93.09% <33.33%> (-0.01%)	⬇️
server-2025R2SP3	93.05% <33.33%> (-0.01%)	⬇️
server-2026R1	93.05% <33.33%> (-0.01%)	⬇️
server-latest	93.65% <33.33%> (-0.01%)	⬇️

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