Prevent chart nested elements from injecting

[glebfox]

Environment

Jmix version: 2.7.1 Source: forum

Bug Description

Studio suggest injecting Charts nested elements which cannot be injected

Steps To Reproduce

1. Add configuration as on the screenshot
2. Open context menu on the title element
3. Inject into a view

Current Behavior

Studio suggest injecting Charts nested elements which cannot be injected

Expected Behavior

Studio doesn't suggest injecting Charts nested elements

[glebfox]

Probably it makes sense to set the isInjectable property for @StudioElement to false by default.