text: Title: Bug: New `create_static_files_router` automatically adds routes to schema docs
  Body: ### Description
  
  I found this suprising when using the new static files feature that
  1: It auto adds these to the schema
  2: It adds them under a sort've "ugly" router header `default`
  
  We should fix one or both of those
  
  
  ### URL to code causing the issue
  
  _No response_
  
  ### MCVE
  
  ```python
  from litestar import Litestar
  from litestar.static_files import create_static_files_router
  
  app = Litestar(
      route_handlers=[
          create_static_files_router(directories=["assets"], path="/static"),
      ],
  )
  ```
  
  
  ### Steps to reproduce
  
  ```bash
  1. run mcve
  2. visit /schema
  3. See schema for default
  ```
  
  
  ### Screenshots
  <img width="508" alt="image" src="https://github.com/litestar-org/litestar/assets/45884264/a6145e1a-370f-4105-bfec-cf73bddc90cd">
  
  ### Logs
  
  _No response_
  
  ### Litestar Version
  
  2.7/2.8
  
  ### Platform
  
  - [X] Linux
  - [X] Mac
  - [X] Windows
  - [ ] Other (Please specify in the description above)