Add Nested App Auth API sections to the teams test app

[baljesingh]

Description

Add three new API sections to the Teams test app for UI testing:

1. SendMessageToNestedAppAuthBridge - Send a NAA message to the nested app auth bridge.
2. SendMessageToTopWindow - Send NAA message to the top window.
3. AddChildIframeSection - Add a child nested iframe, which can also call APIs 1 and 2.

Main changes in the PR:

1. Added SendMessageToNestedAppAuthBridge, SendMessageToTopWindow, AddChildIframeSection in NestedAppAuthAPIs.tsx

Validation

Validation performed:

1. Yes, locally using SDK UI testing framework.

Unit Tests added:

N/A

End-to-end tests added:

N/A

Additional Requirements

Change file added: N/A

Ensure the change file meets the formatting requirements.

<Yes/No>

Related PRs:

Remove this section if n/a

Next/remaining steps:

List the next or remaining steps in implementing the overall feature in subsequent PRs (or is the feature 100% complete after this?).

Remove this section if n/a

• Item 1
• Item 2

Screenshots:

Remove this section if n/a

Before	After
< image1 >	< image2 >

[TrevorJoelHarris]

nitpick: this should be nestedChildIframeContainer to match casing elsewhere

[baljesingh]

Corrected. Thank you.

[TrevorJoelHarris]

Let me know when it's ready for review again