This executes the privileged slot swap UMP of our xcm-transactor pallet. If the same extrinsic is executed on our shell-parachain, we will exchange the slot lease information and prolong our slot by around 40 weeks (less than 48 weeks due to slot lease overlap).

Send a batch of dispatch calls.

May be called from any origin except `None`.

- `calls`: The calls to be dispatched from the same origin. The number of call must not
  exceed the constant: `batched_calls_limit` (available in constant metadata).

If origin is root then the calls are dispatched without checking origin filter. (This
includes bypassing `frame_system::Config::BaseCallFilter`).

# <weight>
- Complexity: O(C) where C is the number of calls to be batched.
# </weight>

This will return `Ok` in all circumstances. To determine the success of the batch, an
event is deposited. If a call failed and the batch was interrupted, then the
`BatchInterrupted` event is deposited, along with the number of successful calls made
and the error of the failed call. If all were successful, then the `BatchCompleted`
event is deposited.

- This is about a special action called "privileged slot swap UMP".
- If we do this action on our shell-parachain, it will extend our slot lease by about 40 weeks.
- The slot lease is like a special permission to use a certain time period.
- The reason it's less than 48 weeks is because there is some overlap with the previous slot lease.
- This action is important for our project called polkassembly.

#11 Execute slot swap UMP

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