Auto-wire orchestrion build-time instrumentation in metaframework SDKs

With channel-based instrumentation becoming the default in v11 (#22501), metaframework SDKs should apply the orchestrion bundler transform automatically — zero user config, following the existing Next.js/Nuxt pattern.

Plain browser apps are unaffected: orchestrion only ships via @sentry/node/{vite,webpack,rollup,esbuild} and framework server builds, so no client-side flag is needed.