Onfetchavatarpersonadata should allow returning undefined

[carocao-msft]

What

Onfetchavatarpersonadata should allow returning undefined

Why

https://skype.visualstudio.com/SPOOL/_workitems/edit/3883949

How Tested

Process & policy checklist

• [ ] I have updated the project documentation to reflect my changes if necessary.
• [ ] I have read the CONTRIBUTING documentation.

Is this a breaking change?

• [ ] This change causes current functionality to break.

[github-actions[bot]]

Storybook 8 URL https://60c7ae6891f0e90039d7cd54-sfbuzxhmim.chromatic.com/

[github-actions[bot]]

@azure/communication-react jest test coverage for stable.

	Lines	Statements	Functions	Branches
Base	26966 / 43505 61.98%	26966 / 43505 61.98%	735 / 1354 54.28%	2184 / 3493 62.52%
Current	26961 / 43505 61.97%	26961 / 43505 61.97%	735 / 1354 54.28%	2161 / 3482 62.06%
Diff	-5 / 0 -0.01%	-5 / 0 -0.01%	0 / 0 0%	-23 / -11 -0.46%

[github-actions[bot]]

@azure/communication-react jest test coverage for beta.

	Lines	Statements	Functions	Branches
Base	54613 / 90378 60.42%	54613 / 90378 60.42%	1108 / 2572 43.07%	3249 / 5398 60.18%
Current	54635 / 90378 60.45%	54635 / 90378 60.45%	1108 / 2572 43.07%	3239 / 5388 60.11%
Diff	22 / 0 0.03%	22 / 0 0.03%	0 / 0 0%	-10 / -10 -0.07%

[github-actions[bot]]

Storybook 8 URL https://60c7ae6891f0e90039d7cd54-pdmjatckhl.chromatic.com/

[github-actions[bot]]

Calling bundle size is not changed.

• Current size: 11767065
• Base size: 11767065
• Diff size: 0

[github-actions[bot]]

Chat bundle size is not changed.

• Current size: 1762310
• Base size: 1762310
• Diff size: 0

[github-actions[bot]]

CallWithChat bundle size is not changed.

• Current size: 11767078
• Base size: 11767078
• Diff size: 0

[github-actions[bot]]

Storybook 8 URL https://60c7ae6891f0e90039d7cd54-gmhiyoajyb.chromatic.com/