monaco: command Save All now formats all open editors

[DucNgn]

What it does

Fixes #8547

• Command Save All now formats all opening editors.
• Instead of calling executeCommand from commandService, calling runAction to manually format each editor. runAction is being used similar to Manually execute "Format Code" action microsoft/monaco-editor#32 (comment)

How to test

• Make sure formatOnSave is on
• Opening more than 1 dirty file and in a wrong format/convention
• Run Save All from the command palette or from a shortcut
• Expected behavior: All the opening editors are formatted and saved.

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: Duc Nguyen duc.a.nguyen@ericsson.com

[vince-fugnitto]

The changes work very well with the example provided in the comment.
Now when we perform the save all we format all open documents and not only the currently active one (similarly to vscode).

[paul-marechal]

LGTM, this way ensures the command is ran directly on the editor and avoids the indirection through this commandService property.