ref: Remove Python 2 compat from qualname_from_function

The SDK requires Python ≥ 3.6, so the `im_class` try/except and the
`__name__` fallback annotated "Python 2.7 has no __qualname__" can
never fire. Dropping them also removes a broad `except Exception:
pass` that could mask real bugs in the happy path.

No behavior change for any Python 3 input; return contract is
preserved for callers in `tracing_utils.py`, `integrations/ray.py`,
`integrations/asgi.py`, and `integrations/django/tasks.py`.

Refs PY-2298
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ericapisani

sentry_sdk/utils.py

@@ -1472,16 +1472,6 @@ def qualname_from_function(func: "Callable[..., Any]") -> "Optional[str]":
     """Return the qualified name of func. Works with regular function, lambda, partial and partialmethod."""
     func_qualname: "Optional[str]" = None
 
-    # Python 2
-    try:
-        return "%s.%s.%s" % (
-            func.im_class.__module__,  # type: ignore
-            func.im_class.__name__,  # type: ignore
-            func.__name__,
-        )
-    except Exception:
-        pass
-
     prefix, suffix = "", ""
 
     if isinstance(func, partial) and hasattr(func.func, "__name__"):
@@ -1499,10 +1489,7 @@ def qualname_from_function(func: "Callable[..., Any]") -> "Optional[str]":
 
     if hasattr(func, "__qualname__"):
         func_qualname = func.__qualname__
-    elif hasattr(func, "__name__"):  # Python 2.7 has no __qualname__
-        func_qualname = func.__name__
 
-    # Python 3: methods, functions, classes
     if func_qualname is not None:
         if hasattr(func, "__module__") and isinstance(func.__module__, str):
             func_qualname = func.__module__ + "." + func_qualname