Remove current workspace member from role assignment picker (#10482)

## Context
Removing the ability to assign yourself from the UI. The backend already
checks that. This is because a member can only have one role for the V1
of permissions
Took the opportunity to move some roles related components in dedicated
folders

packages/twenty-front/src/modules/object-record/record-table/empty-state/components/RecordTableEmptyStateReadOnly.tsx

@@ -14,7 +14,7 @@ export const RecordTableEmptyStateReadOnly = () => {
   return (
     <RecordTableEmptyStateDisplay
       title={t`No records found`}
-      subTitle={t`You are not allowed to create records in this object`}
+      subTitle={t`You are not allowed to create records for this object`}
       animatedPlaceholderType="noRecord"
       buttonTitle={buttonTitle}
       ButtonIcon={IconPlus}