Evals fixes

[cte]

Description

• Allow openRouterApiKey to be overridden by the uploaded Roo Code settings file.
• Make experiment keys optional (older builds won't populate new settings, e.g. marketplace and multiFileApplyDiff)

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Important

Allow openRouterApiKey override and make experiment keys optional, updating types and UI components accordingly.

• Behavior:
  • Allow openRouterApiKey to be overridden by run.settings in runTask() in runTask.ts.
  • Make experiment keys optional in experimentsSchema in experiment.ts.
• Types:
  • Change experiments type from Record<ExperimentId, boolean> to Experiments in ExtensionMessage.ts and experiments.ts.
• UI:
  • Update ExperimentalSettings component in ExperimentalSettings.tsx to use Experiments type.

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