[Screen reader - ADF - Azure data factory] Screen reader doesn't announce state of Azure data factory control.

User Experience:
Screen reader user won't get state of any control if screen reader doesn't provides state for that control and also he/she might get confused for such control. Not only this they won't be able to proceed further because of such confusion and also won't be able to proceed further.

Test Environment:
Application Version: 1.16.0-dev
Build Number: 20200921.1
Screen reader: Narrator, NVDA

Pre-Requisite:
Navigate to the storage expoler.exe and select it.

Repro Steps:​

• Launch Azure Storage Explorer app.
• Navigate and select visual icon control Add data factory control at left panel.
• Verify state of Add data factory control by using screen reader.

Actual Result:
Screen reader doesn't announce state of 'Add data factory' control . It only announce Add data factory button' which might create confusion for the screen reader user as they won't get an idea of button functionality.

Expected Result:
Screen reader should announce the state(Expand/Collapsed) of 'Add data factory' control along with dialog window . It should announce Add data factory button collapsed/expanded so that screen reader user could get an idea of button functionality.

Note:
NVDA also doesn't announce the state of Add data factory button.

MAS1.3.1Azure data factory.zip

Reproduce the issue in Azure Storage Explorer by selecting the Add data factory control in the left panel and checking its announcement with Narrator or NVDA. Trace the control's accessibility implementation and verify that the screen reader announces the button's expanded or collapsed state and associated dialog.