Added result model for ForceOutput

[piotrkluba]

Note

Medium Risk
Introduces new results discovery/downloading paths based on file-list pattern matching and extends the results.download(all=True) gating logic, which could affect what files get downloaded for SimulationParams-based cases.

Overview
Adds first-class support for downloading and reading ForceOutput result CSVs via a new CustomForceResultModel, which discovers per-output files using the force_output_(.+)_v2.csv pattern and exposes name-based access ([]/get_custom_force_by_name) and bulk download.

Wires custom_forces into CaseResultsModel (including download(custom_forces=...) and all=True gating via Case.has_custom_forces() / SimulationParams.has_custom_forces()), and refactors monitor/UDD discovery into _populate_* helpers with tests for idempotency and download-method propagation. Test fixtures are expanded with mock API file listings and sample force-output CSVs plus comprehensive unit tests for discovery, access, download wiring, and CSV loading.

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