Make @apphosting/build package a commonjs type

[annajowang]

This breaks e2e tests but functionality remains the same and this fixes builds on the CLI side.

[gemini-code-assist]

Summary of Changes

Hello @annajowang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily transitions the @apphosting/build package to use the CommonJS module system, ensuring consistent module resolution. This change is accompanied by a minor version increment for the package and an update to a key dependency, pinning it to a specific major version. The modifications aim to improve stability and compatibility within the project's module ecosystem.

Highlights

• Module System Change: The @apphosting/build package has been explicitly configured to use the CommonJS module system by removing the "type": "module" entry from its package.json.
• Version Bump: The version of the @apphosting/build package has been incremented from 0.1.5 to 0.1.6.
• Dependency Update: The @npmcli/promise-spawn dependency in @apphosting/build has been updated from a wildcard * to a specific version range ^3.0.0, along with related dev flag adjustments in package-lock.json.

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[gemini-code-assist]

Code Review

This pull request converts the @apphosting/build package to a CommonJS module by removing the "type": "module" field from its package.json. While this is the main intended change, it introduces critical side effects. The project's test scripts and some source files still use ESM-specific features and import styles (like .js extensions in imports and import.meta.url), which will break in a CommonJS context. These inconsistencies need to be resolved for the package to build and test correctly.