Add lock on geometry when setting values manually

[olemarius90]

Summary

• Add a protected lock_geometry flag to uff.probe that prevents update() from overwriting manually-set element geometry
• When .geometry is set directly (e.g. from external element positions), it is now locked so that subsequent property setters (pitch, N, radius) do not silently recompute and overwrite it
• Internal update() calls reset the lock after computing geometry, so the normal workflow (set N, pitch, radius) is unaffected
• Applied to all probe subclasses: linear_array, curvilinear_array, matrix_array, curvilinear_matrix_array

Motivation

When integrating with external toolboxes (e.g. GEWH Voluson converter), element positions from the external source were set via .geometry, but then overwritten when .pitch or .radius were set afterwards. This caused coordinate mismatches between probe positions and source/origin definitions.

Cherry-picked from ustb/ustb Bitbucket PR 203 by Anders Vraalstad.

Test plan

• Existing uff_probe_test passes (tests use N/pitch, never set geometry manually)
• Verified with GEWH converter: manually-set geometry is preserved after pitch/radius assignment
• Review that no existing examples rely on geometry being overwritten after manual assignment

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