PostProcess: add doNotSerialize (#17369)

This commit adds a doNotSerialize to PostProcess with a default false,
since it’s a class, existing code should not be broken, and derived
classes should inherit this prop.
In SceneSerializer._Serialize, doNotSerialize would be checked like all
other type of objects for PostProcess.
Forum link:
<https://forum.babylonjs.com/t/postprocess-add-donotserialize/61186>

---------

Co-authored-by: David Catuhe <[email protected]>

Author: kzhsw

packages/dev/core/src/Misc/sceneSerializer.ts

@@ -347,7 +347,10 @@ export class SceneSerializer {
         // Post processes
         serializationObject.postProcesses = [];
         for (index = 0; index < scene.postProcesses.length; index++) {
-            serializationObject.postProcesses.push(scene.postProcesses[index].serialize());
+            const postProcess = scene.postProcesses[index];
+            if (!postProcess.doNotSerialize) {
+                serializationObject.postProcesses.push(postProcess.serialize());
+            }
         }
 
         // Action Manager

packages/dev/core/src/PostProcesses/postProcess.ts

@@ -334,6 +334,11 @@ export class PostProcess {
     @serialize()
     public adaptScaleToCurrentViewport = false;
 
+    /**
+     * Specifies if the post process should be serialized
+     */
+    public doNotSerialize = false;
+
     private _camera: Camera;
     protected _scene: Scene;
     private _engine: AbstractEngine;

packages/tools/tests/test/visualization/config.json

@@ -400,12 +400,12 @@
         },
         {
             "title": "Node material PBR 1",
-            "playgroundId": "#D8AK3Z#107",
+            "playgroundId": "#D8AK3Z#121",
             "referenceImage": "node-material-pbr-1.png"
         },
         {
             "title": "Node material PBR Pure WebGPU",
-            "playgroundId": "#D8AK3Z#108",
+            "playgroundId": "#D8AK3Z#122",
             "referenceImage": "node-material-pbr-2.png",
             "excludedEngines": ["webgl1", "webgl2"]
         },
@@ -1301,17 +1301,17 @@
         },
         {
             "title": "PBR shader code coverage 1",
-            "playgroundId": "#QI7TL3#59",
+            "playgroundId": "#QI7TL3#63",
             "referenceImage": "pbr-codecoverage1.png"
         },
         {
             "title": "PBR shader code coverage 2",
-            "playgroundId": "#QI7TL3#60",
+            "playgroundId": "#QI7TL3#64",
             "referenceImage": "pbr-codecoverage2.png"
         },
         {
             "title": "PBR shader code coverage 3",
-            "playgroundId": "#QI7TL3#61",
+            "playgroundId": "#QI7TL3#65",
             "referenceImage": "pbr-codecoverage3.png"
         },
         {