ATOM-13512 Altering IBL ImageProcessor .preset Does Not Force Assets to Rebuild (#5639)

Changes include:
- Move config files from ImageProcessingAtom/Config/ folder to ImageProcessingAtom/Assets/Config/ folder so it can be watched as source depencies.
- Change GetSuggestedPreset function so it can return certain preset for certain file name.
- Move file mask mappings from preset to ImageBuilder.settings. But the file masks in preset can still be used.
- Changed from using project config folder's imageBuilder.Settings for override to using it as json merge patch.
- Expose GetFileHash function in AssetBuilderSDK api.


Signed-off-by: Qing Tao <55564570+VickyAtAZ@users.noreply.github.com>

Gems/Atom/Asset/ImageProcessingAtom/Code/Source/Processing/Utils.cpp

@@ -385,6 +385,13 @@ namespace ImageProcessingAtom
             }
             return true;
         }
+
+        bool NeedAlphaChannel(EAlphaContent alphaContent)
+        {
+             return (alphaContent == EAlphaContent::eAlphaContent_OnlyBlack
+                        || alphaContent == EAlphaContent::eAlphaContent_OnlyBlackAndWhite
+                        || alphaContent == EAlphaContent::eAlphaContent_Greyscale);
+        }
     }
 
 } // namespace ImageProcessingAtom