Update settings toggles to use consistent design across app.

[Half-Shot]

This changes the settings toggles across Element to use a left hand side toggle, which improves our accessibility across the app. In a few places we also switch to SettingsFlag where we can, to reduce reuse of common patterns. In a handful of places this also aligns the help text of a switch to directly below it, or adds a disabled reason when a toggle is disabled without a reason presented to a user.

Changes areas (with screenshot test):

• ApperanceTab
• CreateRoomDialog
• DeclineInviteDialog
• DevToolsDialog
• ReportRoomDialog
• RoomUpgradeWarningDialog
• WidgetCapabilitiesPromptDialog
• WidgetOpenIDPermissionsDialog
• EnableLiveShare
• General Room Tab
• Notifications
• NotificationSettings (new)
• SecurityTab
• RoomSecurityTab
• VoipRoomSettingsTab
• PreferencesTab
• VoiceUserSettingsTab
• SpaceSettingsVisibilityTab
• SpaceSettingsVisibilityTab

Checklist

• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• I have licensed the changes to Element by completing the Contributor License Agreement (CLA)