chore(react-avatar): Rename AvatarGroupOverflow to AvatarGroupPopover

[sopranopillow]

This PR renames AvatarGroupOverflow to AvatarGroupPopover.

Fixes #24216

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit ba25802:

Sandbox	Source
@fluentui/react 8 starter	Configuration
@fluentui/react-components 9 starter	Configuration

[fabricteam]

📊 Bundle size report

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-alert Alert	82.771 kB 20.584 kB
react-avatar Avatar	48.18 kB 13.616 kB
react-avatar AvatarGroup	15.068 kB 6.016 kB
react-avatar AvatarGroupItem	68.333 kB 19.018 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	188.673 kB 51.804 kB
react-components react-components: FluentProvider & webLightTheme	32.786 kB 10.759 kB

_{🤖 This report was generated against 27a3480f5361aa5d99f8978817d8395d9037e3b7}

[fabricteam]

Perf Analysis (@fluentui/react-components)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	1261	1255	5000
Button	mount	957	955	5000
FluentProvider	mount	1587	1554	5000
FluentProviderWithTheme	mount	623	625	10
FluentProviderWithTheme	virtual-rerender	594	593	10
FluentProviderWithTheme	virtual-rerender-with-unmount	628	629	10
MakeStyles	mount	1931	1920	50000
SpinButton	mount	2510	2435	5000

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 27a3480f5361aa5d99f8978817d8395d9037e3b7 (build)