New `is_default_workspace` field

As part of a gradual multi-product migration, users will eventually be able to return the ID of the main workspace instead of null (read more here).

We added the is_default_workspace field to API versions 2024-04 and later to help identify which workspace is the main one. This field returns true if a workspace is the main one or false if it isn't.

query {
  workspaces {
    id
    is_default_workspace
    name
  }
}