feat(cloudflare): Instrument bundled packages via orchestrion diagnostics channels

Integrate the server-utils orchestrion channel-integration mechanism into the
Cloudflare SDK, so bundled npm packages (e.g. `mysql`) are traced without
monkey-patching, which workerd doesn't support anyway.

- Add the `@sentry/cloudflare/vite` plugin, which runs the orchestrion transform
  (injecting `diagnostics_channel.tracingChannel` calls) and injects a
  registration module that puts the channel-subscriber integrations on the
  global marker. Workers built without the plugin don't ship that code.
- `getDefaultIntegrations()` reads the registered integrations from the marker
  at `init()`, activating only those whose module was actually transformed, and
  warns (debug only, once per isolate) about modules whose transform failed.
- Add a Cloudflare + MySQL e2e test app exercising real `db` spans in workerd.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: JPeer264

packages/cloudflare/src/sdk.ts

@@ -5,6 +5,7 @@ import {
   dedupeIntegration,
   functionToStringIntegration,
   getIntegrationsToSetup,
+  GLOBAL_OBJ,
   inboundFiltersIntegration,
   initAndBind,
   linkedErrorsIntegration,
@@ -27,7 +28,7 @@ import { defaultStackParser } from './vendor/stacktrace';
  * TODO(v11): Use `@sentry/server-utils/orchestrion` once we move to `nodejs_compat` by default
  */
 function getRegisteredChannelIntegrations(): Integration[] {
-  const marker = globalThis.__SENTRY_ORCHESTRION__;
+  const marker = GLOBAL_OBJ.__SENTRY_ORCHESTRION__;
   const registered = marker?.integrations || [];
 
   return registered.map(factory => factory());