Switched Gradient Surface benchmarks to use actual surface components. (#7468)

* Switched Gradient Surface benchmarks to use actual surface components.
The gradient unit tests and benchmarks were previously using a mock surface data system, which led to misleading benchmark results. Now, the actual SurfaceData system gets constructed, and the tests use a mock provider, but the benchmarks use actual shape providers for more realistic benchmarking.

Signed-off-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>

* Fixed unit tests to have better query ranges.
Half of each previous range was querying outside the surface provider's data.

Signed-off-by: Mike Balfour <82224783+mbalfour-amzn@users.noreply.github.com>

Gems/GradientSignal/Code/Tests/GradientSignalTestHelpers.cpp

@@ -13,11 +13,11 @@
 
 namespace UnitTest
 {
-    void GradientSignalTestHelpers::CompareGetValueAndGetValues(AZ::EntityId gradientEntityId, float shapeHalfBounds)
+    void GradientSignalTestHelpers::CompareGetValueAndGetValues(AZ::EntityId gradientEntityId, float queryMin, float queryMax)
     {
         // Create a gradient sampler and run through a series of points to see if they match expectations.
 
-        const AZ::Aabb queryRegion = AZ::Aabb::CreateFromMinMax(AZ::Vector3(-shapeHalfBounds), AZ::Vector3(shapeHalfBounds));
+        const AZ::Aabb queryRegion = AZ::Aabb::CreateFromMinMax(AZ::Vector3(queryMin), AZ::Vector3(queryMax));
         const AZ::Vector2 stepSize(1.0f, 1.0f);
 
         GradientSignal::GradientSampler gradientSampler;
@@ -118,6 +118,7 @@ namespace UnitTest
             AZStd::vector<float> results(totalQueryPoints);
             GradientSignal::GradientRequestBus::Event(
                 gradientId, &GradientSignal::GradientRequestBus::Events::GetValues, positions, results);
+            benchmark::DoNotOptimize(results);
         }
     }
 
@@ -174,6 +175,7 @@ namespace UnitTest
             // Query and get the results.
             AZStd::vector<float> results(totalQueryPoints);
             gradientSampler.GetValues(positions, results);
+            benchmark::DoNotOptimize(results);
         }
     }