Close tabs of same project

### Description

It would be nice to have two extra options in context menu of Editor's tabs:
- Close tabs of this project
- Close tabs of other projects

### Use case/motivation

Specially in multiprojects, it's usual to open many files belonging to several projects, looking for some piece of code or information. When you need to close all unnecessary tabs, you have to do it one by one. These 2 options would be very useful.

### Related issues

_No response_

### Are you willing to submit a pull request?

No

### Code of Conduct

Yes

Start from the Editor's tab context-menu implementation and trace how open tabs are associated with projects. Add context-menu options to close tabs belonging to the current project or to other projects, and verify both actions in a multiproject workspace with tabs from several projects.

Written by the indexing model from the issue text.