[Settings> Add new profile]: Confirmation message is not announced by Screen Reader when user create a new profile and duplicate the profile.

### 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. Open Narrator using 'Win + Ctrl + Enter' keys.
4. Activate 'Add a new profile' tab, then activate 'New Empty profile' and 'Duplicate' button.
5. Observe the issue.

**User Experience:**
Screen Reader users UX will not be good if there will not be able to know whether the action is performed successfully or not.

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

**Attachments:**
[Confirmation message is not announced by Screen Reader when user create a new profile and Duplicate the profile..zip](https://github.com/microsoft/terminal/files/7778772/Confirmation.message.is.not.announced.by.Screen.Reader.when.user.create.a.new.profile.and.Duplicate.the.profile.zip)

### Expected Behavior

Confirmation message should be announced by Screen Reader when user create a new profile and duplicate the profile.
i.e. When New profile created successfully, Screen Reader should 'profile name created successfully' and When user duplicated a profile Screen Reader should announce 'profile name created successfully'.

### Actual Behavior

Confirmation message is not announced by Screen Reader when user create a new profile and duplicate the profile.

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

Start by reproducing the issue in Windows Terminal Settings with Narrator, NVDA, or JAWS while creating and duplicating a profile. Trace the Settings UI handling for those actions and verify that the profile name and successful creation are announced by the screen reader.

Written by the indexing model from the issue text.