fix(nuxt): add vite vue plugins if they are missing

[danielroe]

Description

resolves #508
related: danielroe/nuxt-vitest#130

In Nuxt we moved the injection of vue plugins to after the hook we are using in histoire. (To allow modules to modify the config for them.) This change adds them to Nuxt's vite plugins if they are missing - so it should be backwards compatible.

(Though we might want to make them peer dependencies?)

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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