Add screenshot tests infrastructure to Fluent UI Web Components v3

[miroslavstastny]

Tooling

• Add screenshot tests infrastructure to Fluent UI Web Components v3 to test feat (web-components-v3): Add dedicated vr-tests package and integrate with Visual Regression Pipelines #28222
• light and dark theme, rtl chore(fluent-accordion): Add screenshot tests #28441
• forced-colors High Contrast

Screenshot tests for preview components

• Accordion chore(fluent-accordion): Add screenshot tests #28441
• Avatar chore(fluent-avatar): Add screenshot tests #28784
• Badge chore(fluent-badge): Add screenshot tests #28794
• Button chore(fluent-button): Add screenshot tests #28797
• Divider chore(divider): Add screenshot tests #28860
• Image
• Label chore(label): Add screenshot tests #28861
• Menu
• MenuList chore(menu-list): Add screenshot tests #28864
• ProgressBar chore(progress-bar): Add screenshot tests #28866
• Radio chore(radio): Add screenshot tests #28868
• Slider chore(slider): Add screenshot tests #28873
• Spinner
• Switch chore(switch): Add screenshot tests #28930
• Tabs chore(tabs): Add screenshot tests #28931
• Text chore(text): Add screenshot tests #28932
• TextInput chore(text-input): Add screenshot tests #28929
• Checkbox chore(checkbox): Add screenshot tests #28871