Icons in Accessible view don't seem right

Testing #191345

![image](https://github.com/microsoft/vscode/assets/3840081/fd38d13b-6a60-4e7d-95a1-223400bba803)

The bell icon for manage extension does not seem correct here, gear icon might be better.
The shown next and show previous should swap places.  `>` and `<` should probably be `<` and `>`
I would expect `x` to be at the end.