Add option to skip creating room after creating space

### Your use case

#### What would you like to do?
After creating a new space, you get prompted to create a new room for the space - the UI should have options to guide the user to skip this and add existing rooms to the new space.

#### Why would you like to do it?
This assumes that the space requires new rooms, rather than the user wanting to create a space to group existing rooms.

#### How would you like to achieve it?

Add either/both of:
- A 'skip' option , that takes the user to the new space, where they will see the existing "Add" button that allows adding existing or new rooms
- An 'Add existing room' option that takes the user to the 'Add existing rooms' modal to add a new room

### Have you considered any alternatives?

_No response_

### Additional context

_No response_