Move concurrent reads into context settings and default to 5

[mrubens]

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Important

Move concurrent file reads setting to context settings with a default of 5 and update related UI components and tests.

• Behavior:
  • Default maxConcurrentFileReads set to 5 in read-file.ts and ClineProvider.ts.
  • Removed concurrentFileReads from experimentIds in experiment.ts.
  • Updated system.test.ts.snap to reflect the new 5-file limit.
• UI Components:
  • Removed ConcurrentFileReadsExperiment.tsx and its test.
  • Added maxConcurrentFileReads slider to ContextManagementSettings.tsx.
  • Updated SettingsView.tsx to handle maxConcurrentFileReads.
• Tests:
  • Removed tests related to concurrentFileReads in experiments.test.ts.

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