fix(NcActionRadio): change modelValue to behave like NcCheckboxRadioSwitch

[Antreesy]

☑️ Resolves

• v-model: Boolean is quite unusable for radio-buttons, as it should store selected value (one from many options)
• Should be changed by developers when migrate from checked to v-model, apart from that works as before

🖼️ Screenshots

🏚️ Before	🏡 After

🚧 Tasks

• check if it's a breaking change
  • this.model = this.$refs.radio.checked is kept for backward compatibility

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 3️⃣ Backport to next requested with a Vue 3 upgrade

[susnux]

Makes sense from my point of view and probably makes usage simpler

[Antreesy]

/backport to next

[ShGKme]

💥 This is a breaking change

Suggested change

	type: [String, Number],
	default: '',
	type: [Boolean, String, Number],
	default: false,

[Antreesy]

We can emphasise more on it in the Changelog, but I'd address this as bug:

According to docs, type checkbox can have Boolean or String[], but type radio does not support it, and it should be String:
https://vuejs.org/guide/essentials/forms#radio
https://vuejs.org/guide/essentials/forms#value-bindings

I also tried to revert changes and experiment, boolean v-model does not change its value in that case:

[ShGKme]

v-model="model" already handles change event and sets new this.model value which results in emitting the value.

It's handled twice now. Please, make sure it's correct, and no extra event is emitted.

[Antreesy]

Removed. Difference with old implementation (adding that to the bug description):

Event	Before	After
@update:*	true	prop value
@change	Event	Event