[3.13] gh-75876: Use functools.wraps() in test.support test decorators (GH-155262) (GH-155311)

bigmemtest() and bigaddrspacetest() returned a wrapper named "wrapper", so
a decorator applied on top of them could not identify the test.
(cherry picked from commit c3aefdb)

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: serhiy-storchaka

Lib/test/support/__init__.py

@@ -1181,6 +1181,7 @@ def bigmemtest(size, memuse, dry_run=True):
     test doesn't support dummy runs when -M is not specified.
     """
     def decorator(f):
+        @functools.wraps(f)
         def wrapper(self):
             size = wrapper.size
             memuse = wrapper.memuse
@@ -1233,6 +1234,7 @@ def internal(*args, **kwargs):
 
 def bigaddrspacetest(f):
     """Decorator for tests that fill the address space."""
+    @functools.wraps(f)
     def wrapper(self):
         if max_memuse < MAX_Py_ssize_t:
             if MAX_Py_ssize_t >= 2**63 - 1 and max_memuse >= 2**31: