node-integration-tests: port trace semantics suites to span streaming

Follow the porting recipe in the parent issue.

Sampling, DSC, envelope headers and span linking. These suites assert on envelope headers and trace propagation rather than on instrumentation output, so they are the ones most likely to expose a real product bug rather than a test rewrite.

## Suites

* Envelope headers and DSC: `tracing/envelope-header/*` (7 dirs), `tracing/dsc-txn-name-update`, `tracing/double-baggage/*` (3 dirs), `tracing/meta-tags`, `tracing/meta-tags-twp`, `tracing/meta-tags-twp-errors`
* Sampling: `tracing/sampling-static`, `tracing/sample-rate-propagation/*` (4 dirs), `tracing/sample-rand-propagation`, `tracing/no-parent-span-client-report`
* Trace lifetime: `tracing/continueTrace`, `tracing/startNewTrace`, `tracing/traceid-recycling`, `tracing/traceid-recycling-with-spans`
* Span shaping: `tracing/linking`, `tracing/maxSpans`, `tracing/tracer-start-active-span-error`
* Public API span surface: `public-api/startSpan/*` (7 dirs), `public-api/beforeSendSpan-static`, `public-api/bindScopeToEmitter`, `public-api/setMeasurement`, `public-api/scopes/*`

## Twins to fold back

`tracing/sampling-streamed`, `tracing/ignoreSpans-streamed/*`, `public-api/beforeSendSpan-streamed`, `context-streamed/*`, and the 6 `public-api/startSpan/*-streamed` dirs.

## Keep static trace lifecycle coverage

This is the group that owns the guard. Keep `tracing/sampling-static` and `public-api/beforeSendSpan-static` on the static pin. Everything else moves.

Start with the porting recipe in the parent issue, then inspect the listed tracing/* and public-api/* suites and their -streamed twins. Port the specified suites to span streaming, fold back the named twins, and keep tracing/sampling-static and public-api/beforeSendSpan-static on the static pin. Done means the listed integration suites cover sampling, propagation, span linking, and public API behavior under span streaming.

由索引模型根据 Issue 内容生成。