fix: fix link types value + model

[xrutayisire]

Description

This PR objective is to clean up and fix the link types (model + value).

This PR initially assumes that we will support allowText and variants for Link To Media and Generic Link.
We are waiting for a final product decision and, of course, this will impact the code if we decide to drop support, as it's the case for Content Relationship.

Model

• allowText should not be defined on Content Relationship
• variants should be defined for Link To Media.

Value

• Ensure all Filled links have text and variants as they are re-used everywhere to define what a link even coming from a generic link can be.
• Ensure EmptyLinkField doesn't by default have text and variant as it's used in ContentRelationshipField
• Omit text and variant manually when types are used for Rich Text

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

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[dani-mp]

left a question and a suggestion

[dani-mp]

what about

Suggested change

	export type WithLinkAdditionalData<Link> = Link & {
	export type WithAdditionalLinkAttributes<Link> = Link & {

another option: WithAdditionalLinkProps