fix(astro): defer to @sentry/cloudflare/vite on Cloudflare Workers

[isaacs]

On Cloudflare Workers, an Astro app needed a hand-written sentry.server.config.* that wraps the adapter's handler, set as the wrangler main. The integration's own Cloudflare plugin wraps astrojs-ssr-virtual-entry, which @astrojs/cloudflare v13 and later no longer emit, so on those versions it wraps nothing.

@sentry/cloudflare/vite can now wrap a package main, such as @astrojs/cloudflare/entrypoints/server. When the user adds sentryCloudflareVitePlugin() to the Vite plugins in astro.config, the integration now leaves the Worker to it:

• It does not add its own Cloudflare wrap plugin.
• It does not add its orchestrion plugin, because the Cloudflare plugin adds one with the workerd-safe diagnostics_channel module.
• It does not inject the default server init. That init reads PUBLIC_SENTRY_DSN, which is not set on Workers, so it disabled the transport. The Cloudflare plugin inits the SDK from instrument.server.* beside the wrangler config, or from env.

The integration detects the plugin by name. Importing it would load @sentry/cloudflare and wrangler for every Astro app.

Apps without the plugin keep the integration's own wrap plugin. It now also matches virtual:cloudflare/worker-entry, the entry module of @cloudflare/vite-plugin, which v13 and later build through. That entry ends in export default mod.default ?? {};, so the plugin now wraps any default export expression, not only a dotted name. When the user's main already wraps the handler, the second withSentry call does nothing new, because each handler method is patched only once.

The astro-6-cf-workers e2e app now uses the new setup: main is the adapter's entry, and the options live in instrument.server.js. This replaces the cloudflare-autoinstrument-package-entry e2e app, as its coverage largely overlaps with it.

Fixes JS-3934
Fixes JS-2893
Fixes #21901
Fixes #25344

[linear-code]

JS-2893

JS-3934

[isaacs]

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[JPeer264]

huge win