Ensure that the generated package.json and tsconfig.json end with a newline.

[Terfno]

Changes

Add new line at the end of generated package.json and tsconfig.json files.

before

{
  "extends": "astro/tsconfigs/strict"
}

after

{
  "extends": "astro/tsconfigs/strict"
}

Testing

How was this change tested?

• I add a test case that check the file does end with new line.
• I run node ./astro/packages/create-astro/create-astro.mjs in my local machine, and check the files end with new line.

Docs

• Could this affect a user’s behavior? We probably need to update docs!
  • No.
  • Generated files will end with new line.
    /cc @withastro/maintainers-docs for feedback!

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