infra: Make Avalonia the default UI (#6375)

* misc: Move Ryujinx project to Ryujinx.Gtk3

This breaks release CI for now but that's fine.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* misc: Move Ryujinx.Ava project to Ryujinx

This breaks CI for now, but it's fine.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* infra: Make Avalonia the default UI

Should fix CI after the previous changes.

GTK3 isn't build by the release job anymore, only by PR CI.

This also ensure that the test-ava update package is still generated to
allow update from the old testing channel.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* Fix missing copy in create_app_bundle.sh

Signed-off-by: Mary Guillemard <mary@mary.zone>

* Fix syntax error

Signed-off-by: Mary Guillemard <mary@mary.zone>

---------

Signed-off-by: Mary Guillemard <mary@mary.zone>

src/Ryujinx/UI/Controls/UpdateWaitWindow.axaml

@@ -0,0 +1,42 @@
+<Window
+    x:Class="Ryujinx.Ava.UI.Controls.UpdateWaitWindow"
+    xmlns="https://github.com/avaloniaui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    Title="Ryujinx - Waiting"
+    SizeToContent="WidthAndHeight"
+    WindowStartupLocation="CenterOwner"
+    mc:Ignorable="d"
+    Focusable="True">
+    <Grid
+        Margin="20"
+        HorizontalAlignment="Stretch"
+        VerticalAlignment="Stretch">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition />
+        </Grid.ColumnDefinitions>
+        <Image
+            Grid.Row="1"
+            Height="70"
+            MinWidth="50"
+            Margin="5,10,20,10"
+            Source="resm:Ryujinx.UI.Common.Resources.Logo_Ryujinx.png?assembly=Ryujinx.UI.Common" />
+        <StackPanel
+            Grid.Row="1"
+            Grid.Column="1"
+            VerticalAlignment="Center"
+            Orientation="Vertical">
+            <TextBlock Name="PrimaryText" Margin="5" />
+            <TextBlock
+                Name="SecondaryText"
+                Margin="5"
+                VerticalAlignment="Center" />
+        </StackPanel>
+    </Grid>
+</Window>