Make span gc test clearer.

tests/tracer/test_tracer.py

@@ -2069,28 +2069,14 @@ def test_gc_not_used_on_root_spans():
     with tracer.trace("test-event"):
         pass
 
-    objects = gc.get_objects()
-    assert len(objects) == 2
-    # It probably doesn't make sense to check the exact nature of the objects, but importantly, everything should get
-    # cleaned up (the root span, trace, context, etc.). If this is not the case, you can uncomment the following code
-    # to inspect the objects that are not being cleaned up.
+    # There should be no more span objects lingering around.
+    assert not any(str(object).startswith("<Span") for object in gc.get_objects())
+
+    # To check the exact nature of the objects and their references, use the following:
 
     # for i, obj in enumerate(objects):
     #     print("--------------------")
     #     print(f"object {i}:", obj)
     #     print("referrers:", [f"object {objects.index(r)}" for r in gc.get_referrers(obj)[:-2]])
     #     print("referents:", [f"object {objects.index(r)}" if r in objects else r for r in gc.get_referents(obj)])
     #     print("--------------------")
-
-    # Expected output:
-    # --------------------
-    # object 0: <hamt_bitmap_node object at 0x7fa749e1db70>
-    # referrers: ['object 1']
-    # referents: [<sentry_sdk.hub.Hub object at 0x7fa745211450>, <ContextVar name='sentry_current_hub' at
-    #   0x7fa74516e660>, None, <ContextVar name='datadog_contextvar' default=None at 0x7fa7490064d0>]
-    # --------------------
-    # --------------------
-    # object 1: <hamt object at 0x7fa745239000>
-    # referrers: []
-    # referents: ['object 0']
-    # --------------------