Nest shouldrender under target APIs

[MitchLillie]

Background

We moved the target-specific APIs around, now under "API -> Target APIs". ShouldRender missed the cutoff.

See: https://shopify-dev.docs.mitch-lillie.us.spin.dev/docs/api/admin-extensions/unstable/api/target-apis/shouldrender-api

Solution

(Describe your solution, why this approach was chosen, and what the alternatives/impacts may be)

🎩

• ...

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

[github-actions]

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