Add ignore lines for Unity Visual Scripting generated files

[WangNianyi2001]

Reasons for making this change:

The Visual Scripting package will generate some files in /Assets directory. These are irrelevant to game developing and could be safely ignored within version management.

Links to documentation supporting these rule changes:

• Official documentation of Visual Scripting for manually git ignoring
• An unofficial tutorial for creating a .gitignore of projects with Visual Scripting

[DryreL]

+1

[github-actions[bot]]

This PR is stale because there have been no updates in 90 days. It will close after 180 days of inactivity. Leave a comment if you want to keep it open :smile:

[WangNianyi2001]

It seems like the change has been made without regarding this PR :(