refactor the JSX plugin, improve performance

[FredKSchott]

Changes

• Refactor the JSX plugin to move expensive work out of the hot code path
• This actually was a nice chance to clean up the file a bit, move some code into helper functions, and remove some redundant code that was no longer needed due to Astro's internal JSX renderer.
• NOTE: This changes one thing about current behavior, which is that it now prioritizes the explicit @jsxImportSource pragma over import scanning. I had assumed that the explicit pragma always beat out the implicit import scanning, and would make the case here that ignoring an explicit pragma is a bug. This change would only impact a user who had a @jsxImportSource to one framework and then ESM imports to another. I don't think that's realistic, but I thought I'd call it out here in case anyone feels differently.

Testing

• Covered by existing tests
• On a flight so can't perf test, but this should be worth merging regardless

Docs

• N/A

[changeset-bot]

🦋 Changeset detected

Latest commit: eb0eddf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
astro	Patch
@e2e/astro-component	Patch
@e2e/error-react-spectrum	Patch
@e2e/error-sass	Patch
@e2e/errors	Patch
@e2e/lit-component	Patch
@e2e/preact-component	Patch
@e2e/react-component	Patch
@e2e/solid-component	Patch
@e2e/solid-recurse	Patch
@e2e/svelte-component	Patch
@e2e/e2e-tailwindcss	Patch
@e2e/ts-resolution	Patch

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