Add a skipif for a test that requires iterator inlining (#27065)

Adds a skipif for a test that only works when iterator inlining is used,
meaning `--baseline` testing cannot be run

[Not reviewed - trivial]

Author: jabraham17

test/library/packages/Python/memleaks/iterate.skipif

@@ -0,0 +1,2 @@
+# requires iterator inlining
+COMPOPTS <= --baseline