fix(tests): Support Python 3.7 importlib.metadata compat

Use importlib_metadata backport fallback for Python 3.7, and handle
the dict return type from entry_points() on older Python versions
where keyword filtering isn't supported.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ericapisani

tests/integrations/opentelemetry/test_entry_points.py

@@ -1,11 +1,24 @@
-from importlib.metadata import entry_points
+try:
+    from importlib.metadata import entry_points
+except ImportError:
+    from importlib_metadata import entry_points
 
 from sentry_sdk.integrations.opentelemetry import SentryPropagator
 
 
 def test_propagator_registered_as_entry_point():
-    eps = entry_points(group="opentelemetry_propagator", name="sentry")
-    matches = list(eps)
+    all_eps = entry_points()
+
+    if isinstance(all_eps, dict):
+        # Python 3.7-3.8 stdlib returns a dict keyed by group
+        matches = [
+            ep
+            for ep in all_eps.get("opentelemetry_propagator", [])
+            if ep.name == "sentry"
+        ]
+    else:
+        matches = list(all_eps.select(group="opentelemetry_propagator", name="sentry"))
+
     assert len(matches) == 1
     assert matches[0].value == "sentry_sdk.integrations.opentelemetry:SentryPropagator"