[Form] Catch-up with v2 changes

[romhml]

Description

Update the Form / FormField components to catch-up with recent v2 changes:

• [x] https://github.com/nuxt/ui/pull/1877
• [x] https://github.com/nuxt/ui/pull/2012
• [x] https://github.com/nuxt/ui/pull/1818
• [x] https://github.com/nuxt/ui/pull/2011
• [ ] https://github.com/nuxt/ui/pull/2047 -> Can't reproduce the original issue with the Radix Component.
• [x] https://github.com/nuxt/ui/pull/2040
• [x] https://github.com/nuxt/ui/pull/2152

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[benjamincanac]

@romhml Can we close this?