Tag JSX exports with astro:renderer

[natemoo-re]

Changes

• Internal change only, but a building-block for two other in-flight PRs
• Commits cherry-picked from Improve error handling #3859
• This change is needs to improve JSX error handling as well as reduce problems with our jsx-runtime
• Blocks Handle metadata for MDX files during build #3915

Testing

Implementation detail

Docs

N/A

[changeset-bot]

⚠️ No Changeset found

Latest commit: 79b11b3

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[natemoo-re]

Closing in favor of #3859 as this was actually NOT needed for #3915