feat(test-callback-typing): Enable span streaming

Turn on top-level trace_lifecycle="stream" and swap the
before_send_transaction callback for before_send_span, matching the
new streamed-span callback API. Bump the sentry-sdk dependency floor
to >=2.68.1, the version that introduced trace_lifecycle.

Author: ericapisani

test-callback-typing/main.py

@@ -1,5 +1,6 @@
 import asyncio
 import os
+from typing import Any
 
 import sentry_sdk
 from sentry_sdk.types import Event, Hint, SamplingContext, Breadcrumb, BreadcrumbHint, MonitorConfig
@@ -22,8 +23,12 @@ def my_before_send(event: Event, hint: Hint) -> Event | None:
     return event
 
 
-def my_before_send_transaction(event: Event, hint: Hint) -> Event | None:
-    return event
+# NOTE: sentry_sdk.types has no public span type to annotate this callback with.
+# `SpanJSON` exists only in the private `sentry_sdk._types` module, which is not
+# re-exported publicly, so `dict[str, Any]` is the best available annotation here.
+# Spans cannot be dropped by this callback, so the return type is not Optional.
+def my_before_send_span(span: dict[str, Any], hint: Hint) -> dict[str, Any]:
+    return span
 
 
 def my_before_breadcrumb(crumb: Breadcrumb, hint: BreadcrumbHint) -> Breadcrumb | None:
@@ -37,14 +42,15 @@ async def main() -> None:
         dsn=os.getenv("SENTRY_DSN", None),
         environment=os.getenv("ENV", "local"),
         traces_sample_rate=1.0,
+        trace_lifecycle="stream",
         profiles_sample_rate=1.0,
         send_default_pii=True,
         debug=True,
         error_sampler=my_error_sampler,
         traces_sampler=my_traces_sampler,
         profiles_sampler=my_profiles_sampler,
         before_send=my_before_send,
-        before_send_transaction=my_before_send_transaction,
+        before_send_span=my_before_send_span,
         before_breadcrumb=my_before_breadcrumb,
     )
 

test-callback-typing/pyproject.toml

@@ -7,7 +7,7 @@ dependencies = [
     "ipdb>=0.13.13",
     "mypy>=1.15.0",
     "ruff>=0.11.5",
-    "sentry-sdk",
+    "sentry-sdk>=2.68.1",
     "typing-extensions>=4.13.2",
 ]