[a11y BUG] Narrator is not announcing the generating output information after invoking the Generate button in the Generate button.

[gregwoo-microsoft]

Repro Steps:
Launch AI Dev Gallery App
Navigate to samples tab and invoke it.
Navigate to Text Drop down and invoke it
Navigate to Generate and invoke it
Now observe the behavior
Actual Result:
Narrator is not announcing the generating output information after invoking the Generate button in the Generate button.
Observation: Narrator is kept remains silent, upon invoking the generate button
Note: This issue is observed throughout the App for All Models in the samples tab.

Expected Result:
Narrator should announce the generating output information after invoking the Generate button in the Generate button.

User Impact: '
Users with low vision who rely on screen reader will be impacted if Narrator is not announcing the generating output information after invoking the Generate button in the Generate button.

Fix: Have the narrator read the generated text