XSS vulnerability in ResourceUtilization with enabled TreeGroup feature

[SergeyMaltsev]

Steps to reproduce

1. Open example
   https://bryntum.com/products/schedulerpro/examples/resourceutilization/

Add xss to column renderer before last line in renderer

return `<img src="xss" onerror="console.log('Failed')">`;
// record.key will have either resource or event so display its name
// return record.key?.name || record.key;

After example reload everything is encoded.

2. Scroll resource histogram down. You will Receive an xss error.