i18n(fr): create reference/modules/astro-actions.mdx

[ArmandPhilippot]

Description (required)

Moves the Actions reference from api-reference.mdx to a new location reference/modules/astro-actions.mdx (see #9687 and #9819)

Note: I didn't remove the content in api-reference.mdx so at the moment the content is duplicated. I think it's better to do that in a separate PR to avoid conflicts.

Related issues & labels (optional)

• Suggested label: i18n

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Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.