[chore] Split the bug template in two (#1500)

Have a separate template for:
* Frontend, with labels bug and frontend and requiring the browser field
* Regular/backend, for other bugs with only the bug label and removal of
  the browser field

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -2,8 +2,8 @@ name: Bug Report
 description: Create a report to help us improve
 title: "[bug] Issue Title"
 labels: [bug]
-assignees:
-  - 
+assignees: []
+
 body:
   - type: markdown
     attributes:
@@ -44,15 +44,6 @@ body:
     validations:
       required: false
 
-  - type: input
-    id: Browser-Version
-    attributes:
-      label: Browser version
-      description: If this is a frontend bug, what browser(s) and versions are you using that show this bug?
-      placeholder: Firefox 103.0b9 (64-bit)
-    validations:
-      required: false
-
   - type: textarea
     id: what-happened
     attributes: