Fix odometer issue in cupra and skoda SoC modules

[vuffiraa72]

Skoda Modul meldet Fehler "zu viele Parameter" durch die gemeinsam mit VWID benutzte vwgroup library.
Dasselbe tritt auch bei Cupra auf.
Der PR ergänzt den fehlenden Parameter für beide Module.
Siehe https://forum.openwb.de/viewtopic.php?p=141495#p141495

[Copilot]

Pull request overview

This PR fixes a runtime mismatch between VWGroup’s SoC data shape and the Skoda/Cupra SoC modules by adding odometer support end-to-end, preventing the “zu viele Parameter” error and enriching the returned vehicle state with mileage.

Changes:

• Update Skoda and Cupra SoC fetch paths to handle and persist the additional odometer value.
• Extend Skoda and Cupra API libraries to fetch and expose odometer (Skoda via maintenance report; Cupra via mileage endpoint).
• Update/introduce unit tests to validate odometer propagation and the additional API calls.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/modules/vehicles/skoda/soc.py	Unpacks/returns odometer in CarState.
packages/modules/vehicles/skoda/api.py	Returns the additional odometer value from fetch_soc.
packages/modules/vehicles/skoda/libskoda.py	Adds maintenance report call to populate odometer; improves 403 fallback behavior.
packages/modules/vehicles/skoda/soc_test.py	Updates tests for 5-tuple SoC return and odometer in status.
packages/modules/vehicles/cupra/soc.py	Unpacks/returns odometer in CarState.
packages/modules/vehicles/cupra/api.py	Returns the additional odometer value from fetch_soc.
packages/modules/vehicles/cupra/libcupra.py	Adds mileage endpoint call and injects odometer into returned status payload.
packages/modules/vehicles/cupra/soc_test.py	Adds coverage for odometer propagation and mileage error behavior.

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