Show attendees from Outlook in the Scheduler Tool

Issue related to: https://github.com/Azure/azure-sdk-tools/issues/5985

If a meeting is fordwaded to someone on Outlook, that person will be added to the outlook event but not in our record in the scheduler. It would be useful if when edditting a meeting in the Scheduler Tool, the user can also see the people who have been invited in outlook.

This is the first step towards a better Outlook integration with the Scheduler Tool. Removing people from Outlook or keeping track of the FW attendees is out of scope for this issue.

Start by reading the related issue #5985 and locating the Scheduler Tool's meeting-edit flow. Trace how Outlook event attendees are represented in the existing record, then make forwarded attendees visible when editing a meeting. Done means invited Outlook attendees appear in the Scheduler Tool without requiring removal or ongoing tracking of forwarded attendees.

Written by the indexing model from the issue text.