LYN-8551 Terrain: Renderer: Create compute pass for clipmaps (#7116)

* Allocate a pass that will be used to generate clipmap

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

* Fix some small issues

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

* Rename the pass to avoid future conflict. Move assets to terrain gem.

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

* Turn the pass off

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

* Move pass templates to Terrain gem

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

* move load template to private

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

* Add macro texture compute pass

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

* Fix uncleaned code from previous commit

Signed-off-by: jiaweig <51759646+jiaweig-amzn@users.noreply.github.com>

AutomatedTesting/Passes/MainPipeline.pass

@@ -42,6 +42,16 @@
                         "RayTracingAccelerationStructurePass"
                     ]
                 },
+                {
+                    "Name": "TerrainDetailTextureComputePass",
+                    "TemplateName": "TerrainDetailTextureComputePassTemplate",
+                    "Enabled": false
+                },
+                {
+                    "Name": "TerrainMacroTextureComputePass",
+                    "TemplateName": "TerrainMacroTextureComputePassTemplate",
+                    "Enabled": false
+                },
                 {
                     "Name": "DepthPrePass",
                     "TemplateName": "DepthMSAAParentTemplate",
@@ -215,7 +225,7 @@
                     // Note: The following two lines represent the choice of rendering pipeline for the hair.
                     // You can either choose to use PPLL or ShortCut and accordingly change the flag 
                     // 'm_usePPLLRenderTechnique' in the class 'HairFeatureProcessor.cpp'
-//                    "TemplateName": "HairParentPassTemplate",
+                    // "TemplateName": "HairParentPassTemplate",
                     "TemplateName": "HairParentShortCutPassTemplate",
                     "Enabled": true,
                     "Connections": [