[Terminal]: Screen Reader does not announce Confirmation message after actions executed successfully.

### Windows Terminal version

1.12.3472.0

### Windows build number

10.0.22504.1010

### Other Software

**Test Environment:**
OS: Windows 11 Version Dev (OS Build 22504.1010)
App: Windows Terminal Preview
Screen Reader: Narrator

### Steps to reproduce

**Repro Steps:**
1. Open Windows Terminal.
2. Open Settings page using 'Ctr+,'.
3. Activate 'Actions' tab.
4. Open Narrator using 'Win + Ctrl + Enter' keys.
5. Perform all available actions present inside 'Actions' tab.
6. Observe the issues.

**User Experience:**
Screen Reader users UX will not be good as they will not be able to know whether the actions performed successfully or not.

**Guideline Reference:**
EN 301 549 V3.2.1: 11.5.2.15 Change notification

**Attachments:**
[Screen Reader does not announce Confirmation message after actions executed successfully..zip](https://github.com/microsoft/terminal/files/7783208/Screen.Reader.does.not.announce.Confirmation.message.after.actions.executed.successfully.zip)

### Expected Behavior

Screen Reader announce Confirmation message after any actions executed successfully.
i.e. When users reset tab color, Screen Reader should announce 'Tab Color reset successfully'

### Actual Behavior

Screen Reader does not announce Confirmation message after actions executed successfully. Issue repro with all available actions present inside Actions tab page.

**Observation:** Issue also repro with NVDA and JAWS Screen Reader.

Reproduce the issue in the Windows Terminal Settings page's Actions tab using Narrator, then verify the same behavior with NVDA or JAWS as described. Trace how successful actions such as resetting tab color expose confirmation messages; done means each available action produces an announcement for screen reader users.

Written by the indexing model from the issue text.