navigator: update open containing folder command

[vince-fugnitto]

What it does

Closes #12073.

The pull-request updates the OPEN_CONTAINING_FOLDER command simplifying the behavior, and also making it accessible by the tabbar context-menu similarly to VS Code.

How to test

1. start the electron application with a workspace
2. right-click a folder in the navigator, the option should exist to "open containing folder" (different names for different os')
3. confirm the command works as intended
4. open an editor
5. right-click the editor's tabbar, the option should exist to "open containing folder"
6. confirm the command works as intended
7. de-select the editor in the navigator, confirm that step 5 still works
8. open a regular widget in the main-area or side-areas, confirm the command through right-click does not display

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

Signed-off-by: vince-fugnitto vincent.fugnitto@ericsson.com

[msujew]

Looks good to me 👍

[ouliuquan]

This efficiency is really amazing👍