Public bug reported:

[Description]
Customization of the greeter is a requirement from Corporate customers.

Currently the background (plain color or image) of the greeter is hard
coded in the style embedded in the theme. Customizing this background
requires to extract the style sheet from gnome-shell gresource file,
modify it manually, recompile and deploy the new gresource, and add an
alternative to it.

This feature adds 4 gsettings keys to make the background of the greeter
configurable via gsettings. The default value defined the in the theme
is used for keys that are not set.

[Rationale]
Corporate customers use LTS releases and ultimately this will be released for 
20.04.
This changeset needs to land in hirsute before it can be SRUd into prior Ubuntu 
LTS releases. So we would like to submit this FFe to get it into Hirsute first.

[Risks]
The changeset is minimal, isolated and can be easily reverted.
In case of error in the code, GDM will fail to load and it will be immediately 
visible.

[Build]
Builds and tested successfully locally.
Besides the updated JS is not compiled as part of build.

[Upstream Issue]
https://gitlab.gnome.org/GNOME/gdm/-/issues/684

** Affects: gnome-shell (Ubuntu)
     Importance: Medium
         Status: Fix Released

** Affects: gnome-shell (Ubuntu Focal)
     Importance: Medium
         Status: New

** Also affects: gnome-shell (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: gnome-shell (Ubuntu)
       Status: New => Fix Released

** Changed in: gnome-shell (Ubuntu)
   Importance: Undecided => Medium

** Changed in: gnome-shell (Ubuntu Focal)
   Importance: Undecided => Medium

** Changed in: gnome-shell (Ubuntu Focal)
    Milestone: None => ubuntu-20.04.3

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https://bugs.launchpad.net/bugs/1929536

Title:
  [SRU] GDM background configurable with gsettings

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