bench: add_bridges=true for OSQP

[franckgaga]

This is the new way of explicitly constructing LinMPC with OSQP solver. See #379.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (b58cf8e) to head (660c1dd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #380   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files          27       27           
  Lines        5512     5512           
=======================================
  Hits         5434     5434           
  Misses         78       78           

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