[IOAPPX-274] Make Button… accessibilityLabel prop optional + Improve accessibility of selection components (except ListItemSwitch)

[dmnplb]

Short description

This PR makes Button… accessibilityLabel prop optional and improves accessibility of Selection components.

List of changes proposed in this pull request

• accessibilityLabel of ButtonSolid and ButtonOutline is optional now, with fallback to label
• Improve accessibility of ListItemCheckbox and ListItemRadio (ListItemRadioWithAmount included)
• Add accessibility props to RadioButtonLabel
• Add fallback accessibilityLabel to ListItemCheckbox
• Improve accessibility of the ModuleAttachment during loading state
• Add accessibility props to PressableModuleBase
• Make accessibilityLabel prop optional in the ListItemNav component

How to test

Check all the mentioned components with VoiceOver enabled