fix(dev): surface PostCSS config errors

[markdalgleish]

We were swallowing errors when loading PostCSS config so that it didn't break the build for those without a PostCSS config, but this suppresses real errors for PostCSS consumers when there's a problem with their config.

This PR updates the logic so that we only swallow the missing config error and ensure that all other errors are thrown.

I've also refactored all CSS plugins so that the PostCSS config is loaded lazily rather than up-front in the setup hook. Without this change, consumers see the error coming from the first plugin that happens to be instantiated which is confusing if they're not using the feature, e.g. the error comes from the CSS Modules plugin when they're not using CSS Modules.

[changeset-bot]

🦋 Changeset detected

Latest commit: 0b73c03

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 16 packages

Name	Type
@remix-run/dev	Patch
create-remix	Patch
remix	Patch
@remix-run/architect	Patch
@remix-run/cloudflare	Patch
@remix-run/cloudflare-pages	Patch
@remix-run/cloudflare-workers	Patch
@remix-run/css-bundle	Patch
@remix-run/deno	Patch
@remix-run/eslint-config	Patch
@remix-run/express	Patch
@remix-run/node	Patch
@remix-run/react	Patch
@remix-run/serve	Patch
@remix-run/server-runtime	Patch
@remix-run/testing	Patch

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[github-actions]

🤖 Hello there,

We just published version 2.0.0-pre.10 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-3646f91-20230914 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 2.0.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!