fix: only show fifo warnings when perf env is present

Author: not-matthias

crates/criterion_compat/criterion_fork/src/analysis/mod.rs

@@ -305,7 +305,9 @@ mod codspeed {
                     uri: uri.clone(),
                 })
             {
-                if codspeed::utils::running_with_codspeed_runner() {
+                if codspeed::utils::running_with_codspeed_runner()
+                    && std::env::var("CODSPEED_PERF_ENABLED").is_ok()
+                {
                     eprintln!("Failed to send benchmark URI to runner: {error:?}");
                 }
             }

crates/divan_compat/divan_fork/src/divan.rs

@@ -438,7 +438,9 @@ mod codspeed {
                     uri: uri.clone(),
                 })
             {
-                if codspeed::utils::running_with_codspeed_runner() {
+                if codspeed::utils::running_with_codspeed_runner()
+                    && std::env::var("CODSPEED_PERF_ENABLED").is_ok()
+                {
                     eprintln!("Failed to send benchmark URI to runner: {error:?}");
                 }
             }