GtkFileFilter: Add a GObject property for the name

The name field was previously not a property, which meant you couldn't set in in
GtkBuilder as translatable.
2 jobs for file-filter-name-property-3-24 in 7 minutes and 47 seconds (queued for 6 minutes and 43 seconds)
latest
Status Job ID Name Coverage
  Build
passed #118994
build

00:07:47

manual #118995
win32 allowed to fail manual
msys2-mingw32