ref: Move subprocess breadcrumbs to integration (#7128)

### Description
Decouple subprocess breadcrumbs from span data.

#### Issues
Closes #7068

Author: sentrivana

sentry_sdk/integrations/stdlib.py

@@ -305,6 +305,13 @@ def sentry_patched_popen_init(
 
         env = None
 
+        sentry_sdk.add_breadcrumb(
+            type="subprocess",
+            category="subprocess",
+            message=description,
+            data={"subprocess.cwd": cwd} if cwd else {},
+        )
+
         span_streaming = has_span_streaming_enabled(sentry_sdk.get_client().options)
         span: "Union[Span, StreamedSpan]"
         if span_streaming:

sentry_sdk/tracing_utils.py

@@ -234,14 +234,6 @@ def maybe_create_breadcrumbs_from_span(
         else:
             scope.add_breadcrumb(type="http", category="httplib", data=span._data)
 
-    elif span.op == "subprocess":
-        scope.add_breadcrumb(
-            type="subprocess",
-            category="subprocess",
-            message=span.description,
-            data=span._data,
-        )
-
 
 def _get_frame_module_abs_path(frame: "FrameType") -> "Optional[str]":
     try: