[IMP] web: extract progress bar parsing code

The progress bar parsing code was inside a big block of code making it
impossible to override to add custom behaviour.
It is not in a separated function.

Part-of: odoo/odoo#98837

addons/web/static/src/views/kanban/kanban_arch_parser.js

@@ -104,13 +104,7 @@ export class KanbanArchParser extends XMLParser {
         let progressAttributes = false;
         const progressBar = xmlDoc.querySelector("progressbar");
         if (progressBar) {
-            const attrs = extractAttributes(progressBar, ["field", "colors", "sum_field", "help"]);
-            progressAttributes = {
-                fieldName: attrs.field,
-                colors: JSON.parse(attrs.colors),
-                sumField: fields[attrs.sum_field] || false,
-                help: attrs.help,
-            };
+            progressAttributes = this.parseProgressBar(progressBar, fields);
         }
 
         // Concrete kanban box elements in the template
@@ -158,4 +152,14 @@ export class KanbanArchParser extends XMLParser {
             __rawArch: arch,
         };
     }
+
+    parseProgressBar(progressBar, fields) {
+        const attrs = extractAttributes(progressBar, ["field", "colors", "sum_field", "help"]);
+        return {
+            fieldName: attrs.field,
+            colors: JSON.parse(attrs.colors),
+            sumField: fields[attrs.sum_field] || false,
+            help: attrs.help,
+        };
+    }
 }