Make Posthog telemetry the default

[mrubens]

Important

Telemetry is now enabled by default, with UI and privacy policy updates to reflect this change, and users can opt-out via settings.

• Behavior:
  • Telemetry is now enabled by default, users can opt-out via settings.
  • Updates updateTelemetryState() in TelemetryService.ts and webviewMessageHandler.ts to reflect default enabled state.
• UI:
  • Simplifies TelemetryBanner in TelemetryBanner.tsx to remove allow/deny buttons, adds close button.
  • Displays TelemetryBanner only if telemetry setting is "unset".
• Privacy Policy:
  • Updates PRIVACY.md to reflect telemetry is collected by default.
• Translations:
  • Updates telemetry-related messages in multiple locale files to reflect default enabled state.
• Misc:
  • Renames didUserOptIn to isOptedIn in TelemetryService.ts and telemetry.ts.

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