fix: cloudflare waitUntil not working as inteded with getRuntime

[TorbjornHoltmon]

Changes

What does this change?

• The cloudflare context was spread. This did not work and waitUntil was not passed on as intended.
  ( This might also be an issue for other context runtime functions )
• Wait until has to be "proxied" through a function, passing the reference alone will trigger illegal invocations.

Testing

Tested on our own environment.
Has been tested on our advanced mode website.
I cannot speak for directory mode, but I assume the problem is the same.

Docs

No need to update docs, waitUntil should now work as intended.

Comments

I did not bother to mock waitUntil since we already have a mock In our project.

Its up to the Astro team to decide from this point on. But you could do something like what we do:

    waitUntil: (promise: Promise<any>) => {
      if (runtime?.waitUntil) {
        runtime.waitUntil(promise);
      } else {
        Promise.resolve(promise).catch((error) => {
          console.error(error);
          // noop
        });
      }
    },

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