fix: externalize optimizeDeps.exclude via rolldownCjsExternalPlugin (fix test-serve playground/external)

[hi-ogawa]

Description

Currently optimizeDeps.exclude is externalized at the config level rolldown.rolldown({ external: ... }) and it looks like rolldownCjsExternalPlugin doesn't have a chance to fixup cjs external. This manifests as test failures in playground/external.

Since rolldownCjsExternalPlugin also handles non-cjs external, I simply removed rolldown's external config and it looks like tests are passing.

Only the last commit 5edc81d is the actual fix and first commits are the same one from #28.

[underfin]

@hi-ogawa I upgrade the lastet rolldown look like the playground/external could be work.

[hi-ogawa]

I think playground/external is still failing (see #33). I added one commit on top of PR-33 and the test is passing here.

[hi-ogawa]

It looks like CreateModuleContext.resolve_id https://github.com/rolldown/rolldown/blob/95b15b77340425186148badbee0c2dcf0280c484/crates/rolldown/src/types/module_factory.rs#L30-L51 checks external first, then if it matches, it won't call resolve_id_with_plugins, so it's necessary to remove external config to make it work.

[underfin]

Ok.