[FEATURE]: Default-on telemetry is inappropriate for an open-source tool

### Is your feature request related to a problem? Please describe. Raspberry Pi Imager includes anonymous telemetry that is enabled *by default*. This is unexpected for an open-source utility and breaks common FOSS expectations of: - no data collection without explicit consent, - transparency, - user control, - minimal data gathering. The application already distributes all official OS images from Raspberry Pi’s own infrastructure, so popularity and usage statistics can be measured server-side without collecting any host system information from users. **Concerns:** - Telemetry is opt-out instead of opt-in. - The tool sends URLs of selected OS images. - Host OS version, architecture and locale are transmitted. - Heroku retains logs of the last ~1500 requests for a week. - Users are not informed on first launch. Open-source tools should respect user privacy by default. Please reconsider the current approach. ### Describe the solution you would like to see implemented Disable telemetry by default, add an opt‑in prompt on first launch, and provide a build option to compile Imager without telemetry. ### Describe alternatives you've considered Remove host OS data collection entirely; server-side download stats are sufficient. ### Additional context All OS images are already served from Raspberry Pi infrastructure, so usage statistics can be collected server‑side without client telemetry. ### Version 2.0.9 (Default)