Reorganize the Flatpak-related test cases

This reorganizes and tweaks the Flatpak test cases to better express
their intent:

- Renames the `flatdeb-` prefix, which wasn't all that clear.
- Renames the legacy tests depending on mildenhall to match, and ensures
  they're tied to v2021.
- Rewords the contents of the tests to be more consistent and updated
  for the current state of things.
- Reworks the HMI demo test to use the app icon rather than launching
  from the CLI

https://phabricator.apertis.org/T8170



Signed-off-by: Ryan Gonzalez <ryan.gonzalez@collabora.com>

test-cases/flatdeb-demo.yaml

-metadata:
-  name: flatdeb-demo
-  format: "Apertis Test Definition 1.0"
-  image-types:
-    hmi:    [ amd64, armhf ]
-    sdk:    [ amd64, arm64, armhf ]
-  image-deployment:
-    - APT
-  type: functional
-  exec-type: manual
-  priority: medium
-  maintainer: "Apertis Project"
-  description: "Test Flatpak demo application"
-
-  expected:
-    - "The Flatpak demo application can be installed and run on a clean system."
-    - "@flatdeb-demo-screenshot.png"
-
-run:
-  steps:
-    - "Add the Apertis Flatpak repository (only needed on SDK images)"
-    - $ flatpak --user remote-add apertis https://images.apertis.org/flatpak/repo/apertis.flatpakrepo
-    - "Install the Flatpak demo application (only needed on SDK images)"
-    - $ flatpak --user install org.apertis.demo.gnome_font_viewer//${APERTIS_RELEASE}
-    - "Run the demo application:"
-    - $ flatpak run org.apertis.demo.gnome_font_viewer

test-cases/sdk-flatpak-build-helloworld-app.yaml → test-cases/flatpak-build-mildenhall-helloworld-app.yaml

 metadata:
-  name: sdk-flatpak-build-helloworld-app
+  name: flatpak-build-mildenhall-helloworld-app
   format: "Apertis Test Definition 1.0"
   image-types:
     sdk:     [ amd64 ]
@@ -12,7 +12,6 @@ metadata:
   description: "Install mildenhall runtime, build helloworld-app using mildenhall runtime
                  and run the helloworld-app."
 
-  macro_install_packages_preconditions: flatpak-builder
   pre-conditions:
     - "Please uninstall the org.apertis.mildenhall.helloworld-app if already installed."
     - $ flatpak uninstall org.apertis.mildenhall.helloworld-app
@@ -24,7 +23,7 @@ metadata:
 run:
   steps:
     - "Clone the helloworld-app"
-    - $ git clone https://gitlab.apertis.org/sample-applications/helloworld-app.git
+    - $ git clone https://gitlab.apertis.org/sample-applications/helloworld-app.git -b apertis/v2021
     - "Add remote for mildenall runtime:"
     - $ flatpak --user remote-add --if-not-exists --no-gpg-verify apertis-mildenhall https://images.apertis.org/flatpak/mildenhall
     - "Install the org.apertis.mildenhall.Platform org.apertis.mildenhall.Sdk "

test-cases/sdk-flatpak-demo.yaml → test-cases/flatpak-run-demo-cli-app.yaml

 metadata:
-  name: sdk-flatpak-demo
+  name: flatpak-run-demo-cli-app
   format: "Apertis Test Definition 1.0"
   image-types:
+    target:  [ amd64 ]
     sdk:     [ amd64 ]
   image-deployment:
     - APT
@@ -9,10 +10,10 @@ metadata:
   exec-type: automated
   priority: medium
   maintainer: "Apertis Project"
-  description: "Install and run org.apertis.demo.curl flatpak application."
+  description: "Test a headless Flatpak demo application"
 
   expected:
-    - "org.apertis.demo.curl is able to retrieve https://www.apertis.org."
+    - "org.apertis.headless.curl is able to retrieve https://www.apertis.org."
 
 install:
   deps:
@@ -26,4 +27,4 @@ run:
     - "# Enter test directory:"
     - cd apertis-tests
     - "# Execute the following command:"
-    - common/run-test-in-systemd --user=user --basename -- sdk/automated/test-flatpak-demo.sh
+    - common/run-test-in-systemd --user=user --basename -- flatpak/automated/test-flatpak-demo.sh

test-cases/flatdeb-example-app.yaml → test-cases/flatpak-run-demo-hmi-app.yaml

 metadata:
-  name: flatdeb-example-app
+  name: flatpak-run-demo-hmi-app
   format: "Apertis Test Definition 1.0"
   image-types:
     hmi:    [ amd64, armhf ]
@@ -10,11 +10,11 @@ metadata:
   exec-type: manual
   priority: medium
   maintainer: "Apertis Project"
-  description: "Test Flatpak example application"
+  description: "Test a graphical Flatpak demo application"
 
   expected:
-    - "The Flatpak example application can be installed and run on a clean system."
-    - "@flatdeb-demo-screenshot.png"
+    - "The Flatpak application can be installed and run on a clean system."
+    - "@flatpak-demo-hmi-screenshot.png"
 
 run:
   steps:
@@ -22,5 +22,7 @@ run:
     - $ flatpak --user remote-add --if-not-exists apertis https://images.apertis.org/flatpak/repo/apertis.flatpakrepo
     - "Install the Flatpak example application (only needed on SDK images)"
     - $ flatpak --user install --reinstall org.apertis.hmi.gnome_font_viewer//${APERTIS_RELEASE}
-    - "Run the example application:"
-    - $ flatpak run org.apertis.hmi.gnome_font_viewer
+    - "On the agl-compositor click on the menu icon"
+    - "Observe that the Fonts app icon is visible"
+    - "@flatpak-demo-hmi-icon-screenshot.png"
+    - "Launch the Fonts app"

test-cases/sdk-flatpak-helloworld-app.yaml → test-cases/flatpak-run-mildenhall-helloworld-app.yaml

 metadata:
-  name: sdk-flatpak-helloworld-app
+  name: flatpak-run-mildenhall-helloworld-app
   format: "Apertis Test Definition 1.0"
   image-types:
+    hmi:     [ amd64 ]
     sdk:     [ amd64 ]
   image-deployment:
     - APT