Discretise geometric parameters with SymbolicUniform mesh

[BradyPlanden]

Feature description

PyBaMM v25.1 includes a new SymbolicUniform mesh type, enabling geometric parameters to be 'input' parameters to the PyBaMM solvers. This issue is to update our EChem model rebuild process to use the SymbolicMesh where possible for performance improvements alongside sensitivity information.

Motivation

No response

Possible implementation

PyBaMM PR: pybamm-team/PyBaMM#4665
PyBaMM example: https://github.com/pybamm-team/PyBaMM/blob/develop/docs/source/examples/notebooks/parameterization/geometric_parameters.ipynb

Additional context

No response