chore(OnyxFlyoutMenu)!: Replace VNode dependency with slot parameters

[JoCa96]

Relates to #1595

In preparation to support nesting.

• Added component tests for the flyout menu
• Replaced the VNodes unwrapping with slot parameters to avoid reliance on Vue internals
  • feat(OnyxNavButton, OnyxUserMenu, OnyxFlyoutMenu): button slot now provides a trigger parameter which must be bound to the interactive element
  • feat(OnyxFlyoutMenu): Renamed "default" slot to "button"

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 656a4ae53787f0a7828fd4b58b07014a5e4881f6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

| Name | Type | | ------------------------- | ----- | | sit-onyx | Major | | demo-app | Patch | | playground | Patch | | @sit-onyx/chartjs-plugin | Major | | @sit-onyx/nuxt | Major | | @sit-onyx/vitepress-theme | Major |

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