Port node-integration-tests to span streaming

Port `dev-packages/node-integration-tests` to span streaming. Span streaming is the default, so every suite that still pins `traceLifecycle: 'static'` covers behaviour we no longer ship.

Part of [SDK-1425](https://linear.app/getsentry/issue/SDK-1425/port-integration-tests-to-span-streaming), one tracking issue per integration test package.

## Scope

* 299 `traceLifecycle: 'static'` pins across 188 suite directories
* 111 suite directories assert on transaction envelopes and need a real rewrite
* 19 suites already have a `-streamed` twin next to the static original
* 20 suites use the env-gated `traceLifecycle: process.env.STREAMED === 'true' ? 'stream' : 'static'` pattern

## How to port a suite

1. Remove the `traceLifecycle: 'static'` pin from every `Sentry.init` in the suite.
2. If a `-streamed` twin exists, fold it back: delete the static original and rename the twin to the base name. Do not keep both, or the coverage doubles and the two copies drift.
3. If the suite uses the env-gated `STREAMED` switch, drop the switch and keep `'stream'`.
4. Rewrite the assertions from transaction envelopes to span v2:
* `.expect({ transaction })` becomes `.expect({ span })`, which gives a `SerializedStreamedSpanContainer`
* `event.transaction` becomes `span.name`
* `contexts.trace.op` becomes the `sentry.op` attribute 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
5. Streamed child spans arrive across several envelopes, so collect across envelopes wherever a test asserts on children of a segment span.

Watch for span names that become low cardinality under streaming: `http.server`, `http.client`, `db`, `cache`, `gen_ai` and `graphql`. Those assertions change, not just the helper.

Reference suite: `suites/tracing/httpIntegration-streamed`.

## Keep static trace lifecycle coverage

Do not add a `-static` copy per suite. `tracing/sampling-static` and `public-api/beforeSendSpan-static` already guard the static lifecycle for this package.

Start in dev-packages/node-integration-tests and compare suites against tracing/httpIntegration-streamed. Locate static and STREAMED traceLifecycle pins, then inspect transaction-envelope assertions and child-span collection in the affected suites. Done means the package uses span streaming throughout, streamed twins are folded back, assertions cover span v2, and tracing/sampling-static plus public-api/beforeSendSpan-static remain the static coverage.

Scritto dal modello di indicizzazione a partire dal testo della issue.