Fix content render imports flow

[bluwy]

Changes

In the astro:content-render-imports plugin, it calls getContentEntryModuleFromCache in the load hook, but the cache is only set in astro:content-imports's transform hook.

This causes this error to happen in tests sometimes. I'm not sure how it used to work before 😅

[astro:content-render-imports] Could not load /Users/bjorn/Work/oss/astro/packages/integrations/markdoc/test/fixtures/entry-prop/src/content/blog/entry.mdoc (imported by test/fixtures/entry-prop/src/content/blog/entry.mdoc?astroPropagatedAssets=true): Unable to render "/Users/bjorn/Work/oss/astro/packages/integrations/markdoc/test/fixtures/entry-prop/src/content/blog/entry.mdoc". Did you import this module directly without using a content collection query?

This seems to be caused by #6817 which changes the load to transform.

Testing

Existing tests should pass.

Docs

n/a. bug fix.

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[bholmesdev]

Thanks transfor the fix! May want to reconsider this cache entirely seeing how fragile this can be. It only exists for a specific Markdoc feature that's now achievable in userland