feat: gate telemetry behind Cargo feature flags (#8119)

Signed-off-by: Rodolfo Olivieri <rolivier@redhat.com>
Signed-off-by: Douwe Osinga <douwe@squareup.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Douwe Osinga <douwe@squareup.com>

crates/goose-cli/src/session/builder.rs

@@ -579,6 +579,7 @@ async fn configure_session_prompts(
 }
 
 pub async fn build_session(session_config: SessionBuilderConfig) -> CliSession {
+    #[cfg(feature = "telemetry")]
     goose::posthog::set_session_context("cli", session_config.resume);
 
     let config = Config::global();