Preventing aria-label to defualt to id - 20.0.x

[IvanKitanov17]

Closes #15839

Additional information (check all that apply):

• Bug fix
• New functionality
• Documentation
• Demos
• CI/CD

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code (test guidelines)
• This PR includes API docs for newly added methods/properties (api docs guidelines)
• This PR includes feature/README.MD updates for the feature docs
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes ng update migrations for the breaking changes (migrations guidelines)
• This PR includes behavioral changes and the feature specification has been updated with them

[ChronosSF]

@IvanKitanov17 , I am assuming if you set it to null the reader simply reads the text of the node?

[IvanKitanov17]

@IvanKitanov17 , I am assuming if you set it to null the reader simply reads the text of the node?

@ChronosSF Yes, the the content of the dropdown item is being announced.