Port Vue, TanStack & Ember E2E test apps to span streaming

[andreiborza]

Port these E2E test applications to span streaming (8 apps).

ember-strict-resolver already has a streamed variant from #23548 and is the reference for the Ember apps.

Apps

• ember-classic
• ember-embroider
• ember-vite
• tanstack-router
• tanstackstart-react
• tanstackstart-react-cloudflare
• vue-3
• vue-tanstack-router

What to do

For each app:

1. Remove the traceLifecycle: 'static' pin added in test(e2e): Disable span streaming in e2e test applications #22590 from every Sentry.init (client, server, edge). tanstackstart-react reads the lifecycle from E2E_TEST_STREAMED_SPANS; make streaming the single path instead.
2. Rewrite the specs from transaction envelopes to span v2:
   • waitForTransaction becomes waitForStreamedSpan / waitForStreamedSpans
   • event.transaction becomes span.name
   • contexts.trace.op becomes getSpanOp(span) plus span.is_segment
   • contexts.trace.data['x'] becomes span.attributes['x'], which has the shape { value, type }
   • transaction_info.source becomes the sentry.segment.name.source attribute
3. Streamed child spans arrive across several envelopes, so use collectStreamedSpans wherever a test asserts on children of a segment span.

Ember router spans lose their route:a -> route:b name and become Router under streaming, so those assertions have to change.

Reference apps: ember-strict-resolver (streamed variant) and react-router-7-spa-streaming. Worked example: #23797.

Keep static trace lifecycle coverage

This group covers three unrelated SDKs, so one representative does not cover it. Duplicate tanstackstart-react into tanstackstart-react-static, ember-classic into ember-classic-static and vue-3 into vue-3-static, each as-is, and leave those copies on the current transaction-based specs.

Each copy is verbatim; only the app name changes:

• package.json -> name
• start-event-proxy.mjs -> proxyServerName
• every waitForTransaction / waitForError / waitForSession call in tests/

Keep traceLifecycle: 'static' in each copy's Sentry.init calls. The e2e matrix discovers apps by directory, so no CI config change is needed.

ember-strict-resolver already carries a streamed variant from #23548, so the Ember copy may be redundant; check that first.

[linear-code]

JS-3489