fix: wait an extra microtask in dev before calling $$_init_$$

[paoloricciuti]

Closes #14515

TBF this seems like a bug in vite rather than something we should work around here, but I wasn't able to create a minimal repro so in the meantime I'll open this PR and we can discuss.

Basically what happens is that if a client module and a server module import the same remote function during preloading, the module will basically be requested at the same time. This confuses vite and the self_import contains all the exports as undefined, triggering the error within init_remote_functions. If the module is imported by itself, this error doesn't occur.

I can spend a bit more time trying to figure out if that's an actual vite issue or if someone has better ideas we can implement those, but this feels like a simple easy fix that it's not too heavy considering it's only in dev.

I really have no idea how to test this tho 😬

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