docs: add DO_NOT_TRACK environment variable to telemetry documentation (#22076)
* docs: add DO_NOT_TRACK environment variable documentation Add DO_NOT_TRACK=1 as an alternative to DISABLE_TELEMETRY for disabling anonymous telemetry. Update Docker, installer methods, and verification section to document both options. * Apply suggestions from code review Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Apply suggestions from code review Co-authored-by: Fotis Voutsas <fotis@netdata.cloud> * Update docs/netdata-agent/configuration/anonymous-telemetry-events.md * Update anonymous-telemetry-events.md * Apply suggestions from code review Co-authored-by: Fotis Voutsas <fotis@netdata.cloud> * Apply suggestions from code review Co-authored-by: Fotis Voutsas <fotis@netdata.cloud> --------- Co-authored-by: nedi-app[bot] <bot@netdata.cloud> Co-authored-by: Fotis Voutsas <fotis@netdata.cloud> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>