Use `editorGroupHeader.tabsBackground` from VS Code as tab bar background (#3558)

This PR changes the color we use for the tab bar background from the VS
Code theme to `editorGroupHeader.tabsBackground`.

Release Notes:

- N/A

Marshall Bowers committed 2y ago

1d35a815a68b10af12fc2c612ef4910a66b33877

Parent: c653a02

Committed by GitHub <noreply@github.com> on 12/8/2023, 6:50:56 PM