Do not build endpoint code for client

[babichjacob]

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs Endpoint code is built for / accessible to the client #489
• This message body should clearly illustrate what problems it solves. Read Endpoint code is built for / accessible to the client #489
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with pnpm test and lint the project with pnpm lint

Changesets

• If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpx changeset and following the prompts

[Rich-Harris]

whoops 😄 thanks