fix(): Fix edge_split_layers implicit-default warning noise

[benflexcompute]

Note

Low Risk
Small, targeted change to pre-validation/upload serialization that only drops a single implicit field; behavior is covered by unit tests.

Overview
Suppresses warning noise caused by an implicitly injected meshing.defaults.edge_split_layers default during serialization.

Adds strip_implicit_edge_split_layers_inplace() and applies it before both local validation (validate_params_with_context) and draft upload (Draft.update_simulation_params), while preserving edge_split_layers when the user explicitly set it. Includes tests covering implicit vs explicit behavior and verifying the uploaded payload omits only the implicit field.

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