Disable duplicate and discard context menu items when they can’t work

- Disable duplicate for URL with the resource: scheme
- Disable discard for about: URL (except about:blank/newtab)
3 jobs for main in 2 minutes and 3 seconds (queued for 1 second)
Status Job ID Name Coverage
  Lint
passed #992419
lint

00:00:48

 
  Test
passed #992420
test

00:00:35

 
  Build
passed #992421
build

00:00:39