data: Add back (hidden) shortcuts for vertical navigation

Users who customized their workspace shortcuts before updating to
GNOME 40 are experiencing troubles when trying to use the same
keybinding for the horizontal shortcuts, because of hidden conflicts
with the vertical ones.

We can address this by registering the old shortcuts with Settings
without showing them in the UI, so that they are taken into account
by Settings' conflict resolution.

#1740
13 jobs for !1814 with legacy-shortcuts in 21 minutes and 52 seconds
latest detached
Status Job ID Name Coverage
  Review
passed #1243693
check-commit-log

00:00:30

passed #1243694
check-merge-request

00:00:16

 
  Prepare
passed #1243696
aarch64
build-fedora-container@aarch64

00:00:24

passed #1243695
build-fedora-container@x86_64

00:00:30

 
  Build
passed #1243698
aarch64
build-mutter@aarch64

00:06:39

passed #1243697
build-mutter@x86_64

00:01:54

passed #1243700
build-without-native-backend-and-wayland@x86_64

00:02:16

passed #1243699
build-without-opengl-and-glx@x86_64

00:02:12

 
  Test
passed #1243703
can-build-gnome-shell@x86_64

00:01:59

passed #1243702
aarch64
test-mutter@aarch64

00:07:11

passed #1243701
test-mutter@x86_64

00:03:55

 
  Coverage
passed #1243705
aarch64
test-mutter-coverage@aarch64

00:07:03

47.0%
passed #1243704
test-mutter-coverage@x86_64

00:04:04

47.0%