[Outlook] (shared mailboxes) Document scenarios for add-in availability in shared mailboxes

[samantharamon]

Includes improvements for shared mailboxes opened in a new tab or window in Outlook on the web.

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[Copilot]

Pull Request Overview

This PR updates the documentation for Outlook add-in support in shared mailbox and shared folder scenarios.

• Updated metadata (ms.date) and support tables to reflect new release dates and platform updates.
• Revised and expanded content for improved clarity on shared mailbox behavior across different Outlook clients.
• Added a new section detailing add-in support in shared folder and shared mailbox scenarios.

Comments suppressed due to low confidence (1)

docs/outlook/delegate-access.md:25

• [nitpick] Ensure that the footnote marker '*' is used consistently across the document and that its reference in line 31 is clearly defined.

|**Windows (classic)**<br>**Shared folders**: Version 1910 (Build 12130.20272) or later<br><br>**Shared mailboxes**: Version 2304 (Build 16327.20248) or later|Supported|Supported\*|Supported\*|

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