[Bug 1943816] [NEW] "ubuntu-drivers install" needs to be used when installing nvidia-driver if enabling "third-party packages"

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ubiquity calls
```
ubuntu-drivers install $FREEONLY $NOOEM --package-list /run/ubuntu-drivers.autoinstall
```
to generate package list during live system but "ubuntu-drivers install" not only install packages but also create some config files for switching nvidia mode (e.g. on-demand) and change the runtime config as well (e.g. modify the iniramfs).

Thus, not only package list needs to be referred but also the
configuration.

---

In ubuntu-drivers-common, which read the "/run/ubuntu-drivers.autoinstall" to install package. It also skipping the nvidia-mode changing (made by ubuntu-drivers install).
```
$ cat ubiquity/target-config/31ubuntu_driver_packages
#!/bin/sh
set -e

# install all packages that "ubuntu-drivers autoinstall" installed into the
# live system. Ubiquity calls this with --package-list /run/ubuntu-drivers.autoinstall

PKGLIST=/run/ubuntu-drivers.autoinstall
[ -e $PKGLIST ] || exit 0

for p in `cat $PKGLIST`; do
    apt-install $p
done
```

---

We need to use a same approach to make sure the nvidia mode is same on a
same system (either all handing by ubuntu-drivers install or change the
logic to maintainer script in each package).

** Affects: oem-priority
     Importance: Critical
     Assignee: jeremyszu (os369510)
         Status: Confirmed

** Affects: subiquity
     Importance: Undecided
         Status: New

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ubuntu-drivers-common (Ubuntu)
     Importance: High
     Assignee: Alberto Milone (albertomilone)
         Status: Fix Released


** Tags: impish oem-priority patch
-- 
"ubuntu-drivers install" needs to be used when installing nvidia-driver if enabling "third-party packages"
https://bugs.launchpad.net/bugs/1943816
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