feat: update function templates

[jenae-janzen]

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As part of the rollout of the new serverless API, we need to update the CLI function templates to help users discover and correctly use the new API

Summary

Fixes COM-9 Convert the CLI templates for Functions to use the new API

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[github-actions]

📊 Benchmark results

Comparing with 9e5f5c7

• Dependency count: 1,395 (no change)
• Package size: 404 MB (no change)