units: Shut down networkd and resolved on switch-root

Let's explicitly order these against initrd-switch-root.target, so
that they are properly shut down before we switch root. Otherwise,
there's a race condition where networkd might only shut down after
switching root and after we've already we've loaded the unit graph,
meaning it won't be restarted in the rootfs.

Fixes #27718

(cherry picked from commit 75efd16)
(cherry picked from commit 2e10f88)
(cherry picked from commit bc3bad0)

Author: DaanDeMeyer

units/systemd-networkd.service.in

@@ -15,8 +15,8 @@ ConditionCapability=CAP_NET_ADMIN
 DefaultDependencies=no
 # systemd-udevd.service can be dropped once tuntap is moved to netlink
 After=systemd-networkd.socket systemd-udevd.service network-pre.target systemd-sysusers.service systemd-sysctl.service
-Before=network.target multi-user.target shutdown.target
-Conflicts=shutdown.target
+Before=network.target multi-user.target shutdown.target initrd-switch-root.target
+Conflicts=shutdown.target initrd-switch-root.target
 Wants=systemd-networkd.socket network.target
 
 [Service]

units/systemd-resolved.service.in

@@ -16,8 +16,8 @@ Documentation=https://www.freedesktop.org/wiki/Software/systemd/writing-resolver
 
 DefaultDependencies=no
 After=systemd-sysusers.service
-Before=sysinit.target network.target nss-lookup.target shutdown.target
-Conflicts=shutdown.target
+Before=sysinit.target network.target nss-lookup.target shutdown.target initrd-switch-root.target
+Conflicts=shutdown.target initrd-switch-root.target
 Wants=nss-lookup.target
 
 [Service]