Fix aria attributes in ContextualMenu and CommandBar

[T-Hugs]

Pull request checklist

• Addresses an existing issue: Fixes Aria-owns property for ContextualMenu item for a sub menu is wrong #3952 and CommandBar items do not have aria-setsize and aria-posinset attributes #3953
• Include a change request file using $ npm run change

Description of changes

2 Bug fixes:

1. When a ContextualMenu creates a submenu, the aria-owns property on the parent menu item will be wrong if a submenu props object contained an ID.
2. The attributes aria-setsize and aria-posinset are missing from CommandBar. Microsoft Narrator requires these to announce progress through menu items.

Focus areas to test

Unit test included for (1) above. Otherwise this is a low-risk change.

[manishgarg1]

posInSet [](start = 49, length = 8)

Can you please add another value to the snapshot tests such that the count increment is working correctly. Or a unit test would be equally good.

[T-Hugs]

Not sure what you meant by "add another value to the snapshot tests such that the count increment is working correctly" so I added a unit test.

[dzearing]

That works! But he just meant add another item in the items of the command bar in the snapshot unit test which is easier to at least validate in the snapshot that the setSize works. :)

[T-Hugs]

Ok, thanks David!

[manishgarg1]

Please merge master to make the screener tests pass

[manishgarg1]

Test fixes required

[T-Hugs]

@manishgarg1 I am not sure the screener test failures are caused by my changes. I see the same failures in other runs.

Edit: Never mind, I see I need to merge master.

Should wait for micah

[dzearing]

Spinning off screener tests again. If it fails unexpectedly, please remerge master.

I think there are 2 issues;

master was broken - this is now fixed.

screener has a bug which will link "officedev/master" instead of "trevorsg/master" which is hiding what broke. I talked with screener devs, and they're fixing this!