Run E2E tests quietly

We can still get the output. Do we need the extra details like a
progress bar?

.github/workflows/e2e.yml

@@ -70,7 +70,7 @@ jobs:
             fi
             output_file="output_$(basename "$f" .js).txt"
             output_files+=("$output_file")
-            ./k6extension run "$f" > "$output_file" 2>&1 &
+            ./k6extension run -q "$f" > "$output_file" 2>&1 &
             pids+=($!)
           done