leaflet: Drop the deprecated transition types

Drop the deprecated HdyLeafletChildTransitionType and
HdyLeafletModeTransitionType types.
12 jobs for api-1-drop-deprecated in 27 minutes and 12 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #240002
librem5
api-visibility

00:02:52

passed #240005
librem5
build-debian-clang

00:04:22

passed #240003
librem5
build-debian-gcc

00:03:17

passed #240004
librem5
build-debian-gcc-static

00:03:03

passed #240006
librem5
build-fedora-gcc

00:03:28

 
  Test+Docs
passed #240007
librem5
build-gtkdoc

00:02:36

passed #240008
librem5
unit-test

00:02:29

43.8%
 
  Package
passed #240009
librem5
package-debian-buster

00:02:39

passed #240010
librem5:arm64
package-debian-buster:arm64

00:09:42

passed #240011
flatpak
package-flatpak

00:02:17

 
  Test Package
passed #240012
librem5
autopkgtest-debian-buster-package

00:02:44

passed #240013
librem5
lintian-debian-buster-package

00:01:05