fix #7619: don't wrap menu action args into another array

[akosyakov]

What it does

• add integration tests to reproduce fix more command (...) in view containers does not work anymore #7619
• fix more command (...) in view containers does not work anymore #7619 by removing bogus spreading

How to test

• integration tests should be green
• test that context menus are properly rendered in different places, i.e. toolbars for view container, views, editors and so on

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

[vince-fugnitto]

I verified the more ('...') context-menu on both the browser and electron targets and it works like before. I was able to successfully render the context-menu, and also trigger commands.

The integration tests are also successful 👍

[AlexTugarev]

'Change LGTM as well!
Verified that ... menus do work properly now.