Change example data to contain HTML instead of JSON format

Then it's easier for us to show a more readable information about the data we collect

Contributes to CURA-6434.

plugins/SliceInfoPlugin/example_data.html

@@ -0,0 +1,40 @@
+Cura Version: 4.0<br/>
+System type: Windows<br/>
+Machine type: Ultimaker S5<br/>
+Quality profile: Fast<br/>
+Extruder 1:
+<ul>
+    <li>Material type: PLA</li>
+    <li>Print core: AA 0.4</li>
+    <li>Material used: 1240 mm.</li>
+</ul>
+Extruder 2:
+<ul>
+    <li>Material type: PVA</li>
+    <li>Print core: BB 0.4</li>
+    <li>Material used: 432 mm.</li>
+</ul>
+Print settings:
+<ul>
+    <li>Layer height = 0.15</li>
+    <li>Wall line count = 3</li>
+    <li>Enable retraction = no</li>
+    <li>Infill density = 20%</li>
+    <li>Infill pattern = triangles</li>
+    <li>Gradual infill steps = 0</li>
+    <li>Printing temperature = 220 °C</li>
+    <li>Generate support = yes</li>
+    <li>Support extruder = 1</li>
+    <li>Build Plate Adhesion Type = brim</li>
+    <li>Enable prime tower = yes</li>
+    <li>Print sequence = All at once</li>
+    <li>...</li>
+</ul>
+Print times:
+<ul>
+    <li>Infill = 61200 sec.</li>
+    <li>Support = 25480 sec.</li>
+    <li>Travel = 6224 sec.</li>
+    <li>Walls = 10225 sec.</li>
+    <li>Total = 103129 sec.</li>
+</ul>