Add "Registry" folders as scan folders (#4583)

* Add "Registry" folders as scan folders

For projects, Gems, and Engine, add the "Registry" folder as scan
folders.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

* Change params for adding scan folder

Also add trailing newlines to setreg files.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

* Adjust the priority order for project templates

Scan folder orders were way too high, they should be very low to become
highest priority order.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

* Removes change of default assets folder to Assets

Need to revert this change so it can be done separately.
Renamed the scan folder to 'Project/Assets' to prep for Assets folder
change later on.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

* Update platform configuration test to pass

Adjusted expectation of scan folder count from 1 to 2 per Gem for
'Assets' and 'Registry' now.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

Registry/AssetProcessorPlatformConfig.setreg

@@ -106,7 +106,7 @@
                 // "exclude": "mac"
                 // }
 
-                "ScanFolder Game": {
+                "ScanFolder Project/Assets": {
                     "watch": "@PROJECTROOT@",
                     "display": "@PROJECTNAME@",
                     "recursive": 1,
@@ -129,6 +129,11 @@
                     "order": 30000,
                     "include": "tools,renderer"
                 },
+                "ScanFolder Engine/Registry": {
+                    "watch": "@ENGINEROOT@/Registry",
+                    "recursive": 1,
+                    "order": 40000
+                },
 
                 // Excludes files that match the pattern or glob 
                 // if you use a pattern, remember to escape your backslashes (\\)