Fix errcheck linter: explicitly ignore io.Copy error

The linter requires explicit error handling. Since we're in an error
path and only draining the response body for connection reuse, we
explicitly ignore the error with blank identifiers.

Author: samikshya-db

telemetry/featureflag.go

@@ -185,7 +185,7 @@ func fetchFeatureFlag(ctx context.Context, host string, httpClient *http.Client)
 
 	if resp.StatusCode != http.StatusOK {
 		// Read and discard body to allow HTTP connection reuse
-		io.Copy(io.Discard, resp.Body)
+		_, _ = io.Copy(io.Discard, resp.Body)
 		return false, fmt.Errorf("feature flag check failed: %d", resp.StatusCode)
 	}