OP-3940 - added optionality to collector

There might be a reason when artist would like to skip this synchronization for specific workfile.

openpype/hosts/photoshop/plugins/CollectVersion.py

@@ -19,6 +19,7 @@ class CollectVersion(pyblish.api.InstancePlugin):
     families = ["image", "review"]
 
     # controlled by Settings
+    optional = True
     sync_workfile_version = False
 
     def process(self, instance):

openpype/settings/defaults/project_settings/photoshop.json

@@ -16,6 +16,7 @@
             "flatten_subset_template": ""
         },
         "CollectVersion": {
+            "optional": true,
             "sync_workfile_version": true
         },
         "ValidateContainers": {

openpype/settings/entities/schemas/projects_schema/schema_project_photoshop.json

@@ -137,6 +137,11 @@
                     "key": "CollectVersion",
                     "label": "Collect Version",
                     "children": [
+                        {
+                            "type": "boolean",
+                            "key": "optional",
+                            "label": "Optional"
+                        },
                         {
                             "type": "label",
                             "label": "Synchronize version for image and review instances by workfile version."