Restore post-v10.0.0 API changes to Unshipped

Move API changes from commits after v10.0.0 back to Unshipped,
as they represent 11.0 work, not 10.0:

- Remove multiplexing (#6457): 4 *REMOVED* entries
- Remove large object API (#6493): 37 *REMOVED* entries
- Add back parameterless ReloadTypesAsync (#6522): undo the
  v10.0 addition of CancellationToken overload and re-add
  the parameterless overload

Also adjusts Shipped to correctly reflect the v10.0.0 public API.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>