* Add a Jest snapshot of AppPermission
* Move the test inside 'for a pinned widget' category
* Make only spinner message bold
* Set font size specified with "mx_AppPermission_smallText" by default
- Add "mx_AppPermission_largeText" for elements whose size has not been specified with mx_AppPermission_smallText
- Create _AppWarning.pcss for AppWarning
* Make AppPermission panel scrollable, keeping the content at the center
* Run prettier
* Use Heading component
* Use Icon component
* Fix the test
