Canvas: Custom SVG icons not shown

### What happened? In 12.2 in the Canvas component, the custom SVG that was shown carefully in previous versions is not shown. I downgraded to 12.1.1 ### What did you expect to happen? SVG Icons appear on canvas similar previous versions ### Did this work before? Yes ### How do we reproduce it? 1. 2. 3. ### Is the bug inside a dashboard panel? _No response_ ### Environment (with versions)? Grafana: 12.2 OS: Oracle Enterprise Linux 9 Browser: FF,Chrome ### Grafana platform? None ### Datasource(s)? _No response_