messaging: gmail folder backfill (#21753)

demo


https://github.com/user-attachments/assets/a157cee1-a8fa-4050-af1b-c31a83fb75da

/closes #17095


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packages/twenty-client-sdk/src/metadata/generated/schema.graphql

@@ -2943,6 +2943,7 @@ type MessageFolder {
 
 enum MessageFolderPendingSyncAction {
   FOLDER_DELETION
+  FOLDER_IMPORT
   NONE
 }
 
@@ -4374,7 +4375,7 @@ input UpdateMessageFolderInput {
 }
 
 input UpdateMessageFolderInputUpdates {
-  isSynced: Boolean
+  isSynced: Boolean!
 }
 
 input UpdateMessageFoldersInput {