Fix EME port modes symmetry expansion

[caseyflex]

This fixes two related issues:

• The port modes were not symmetry expanded. This was introduced in this PR: Fix field colocation in EMEModeSolverMonitor #2526
• The function EMESimulationData._extract_mode_solver_data did not retain symmetry information.

[lucas-flexcompute]

My only comment is to maybe define port_modes_raw as an internal property _port_modes_raw if we don't want the user poking there. Unless this is handled similarly for other monitors, then just keep it consistent…

[github-actions]

Diff Coverage

Diff: origin/develop...HEAD, staged and unstaged changes

• tidy3d/components/eme/data/sim_data.py (100%)

Summary

• Total: 7 lines
• Missing: 0 lines
• Coverage: 100%

[caseyflex]

My only comment is to maybe define port_modes_raw as an internal property _port_modes_raw if we don't want the user poking there. Unless this is handled similarly for other monitors, then just keep it consistent…

Thanks for the comment. In ModeSimulation we also use modes_raw and modes as the symmetry expanded version. I think there is an issue with the way pydantic handles fields starting with an underscore (it doesn't treat them as actual fields).