test: add tests for CFF flprj files

[PProfizi]

No description provided.

[PProfizi]

@rafacanton this replicates the issue for 252.
Linux: https://github.com/ansys/pydpf-core/actions/runs/18091003615/job/51471371126?pr=2640#step:21:1426
Windows: https://github.com/ansys/pydpf-core/actions/runs/18091003615/job/51471371150?pr=2640#step:21:2145

I have been able to reproduce locally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.41%. Comparing base (0d02f5e) to head (4ab8f0b).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2640   +/-   ##
=======================================
  Coverage   84.41%   84.41%           
=======================================
  Files          92       92           
  Lines       10944    10944           
=======================================
  Hits         9238     9238           
  Misses       1706     1706           

[rafacanton]

@rafacanton this replicates the issue for 252. https://github.com/ansys/pydpf-core/actions/runs/18091003615/job/51471371126?pr=2640#step:21:1426

I have been able to reproduce locally.

Thanks @PProfizi ! And also good to debug in Windows