Modified some views, routes and models to work with the new many-to-many for tests and benchmarks

src/Models/Test.php

@@ -17,11 +17,11 @@ class Test extends Model {
   }
 
   public function benchmark() {
-    return $this->belongsTo(Benchmark::class);
+    return $this->belongsToMany(Benchmark::class);
   }
 
   public function component() {
     return $this->belongsTo(Component::class);
   }
 
-}
+}