Fix @astrojs/markdown-remark bundling for non-node runtimes

[bluwy]

Changes

This will help with withastro/adapters#110 (not a complete fix yet)

For some reason, Rollup sees this:

astro/packages/markdown/remark/src/load-plugins.ts

Line 6 in ea6cbd0

const cwdUrlStr = pathToFileURL(path.join(process.cwd(), 'package.json')).toString();

As side-effectful, so it'll include the import to pathToFileUrl in the final bundle, which wouldn't work for Cloudflare builds.

This PR side-steps by initializing the cwdUrlStr variable lazily, which is also better for perf.

Testing

I didn't add a test because it's hard to create a failing test without a very specific build of Astro.

Docs

n/a. internal change.

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