feat: Add MeetingTabIconSurface to MeetingSurface capabilities

[corinagum]

fixes #4458

Description

Add-on to Meeting Notifications feature, where tab icons can push a notification to alert specified users in the UBar

Specific Changes

• Add new interface MeetingTabIconSurface to teams
• Turn MeetingSurface into union type: MeetingStageSurface<any> | MeetingTabIconSurface
• Add to tests that using MeetingTabIcon payload

Testing

• Unit tests updated
• Manual testing was successful. Different scenarios below:
  • 200: Sending TabIcon to hardcoded sender's user id: returns 200 with empty payload
    
    
  • Success when recipient is just a hardcoded member string: (same as above)
  • 207: Partial success where one of two member id's are invalid: Payload indicates the failure and reason.
    
    
• When recipient array is empty:
  

FE Test container: https://teams.microsoft.com/multi-window/?container=20230421193-oncdn-ba26868c

[coveralls]

Pull Request Test Coverage Report for Build 4768648640

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.003%) to 84.653%

---

Totals
Change from base Build 4198805038:	-0.003%
Covered Lines:	20013
Relevant Lines:	22404

---

💛 - Coveralls