Wait for the asynchronous span collector to release root client spans
after Controller reset or submission. This prevents LeakSanitizer from
reporting pending test spans when the short-lived test binary exits
before the collector’s first polling interval.
Signed-off-by: Zhengwei Zhu <141622927+ZhengweiZhu@users.noreply.github.com>
Keep the current RPC span alive from Controller until the RPC finishes,
SubmitSpan runs, or the Controller is reset. This lets root client spans
without a local parent be submitted to rpcz instead of being destroyed
after the caller-side temporary shared_ptr goes out of scope.
Child client spans remain linked to their parent through weak local-parent
references and parent-owned client lists, so they are still serialized
under their parent without introducing shared_ptr cycles.
Co-authored-by: lh2debug <lh2debug@163.com>
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