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gh-133037: Add test for shadowing __annotate__ (#133084)

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Original file line number	Diff line number	Diff line change
`@@ -327,6 +327,25 @@ def check_annotations(self, f):`
`327`	`327`	`f.__annotations__= {"z":43}`
`328`	`328`	`self.assertIs(f.__annotate__,None)`
`329`	`329`
	`330`	`+deftest_user_defined_annotate(self):`
	`331`	`+classX:`
	`332`	`+a:int`
	`333`	`+`
	`334`	`+def__annotate__(format):`
	`335`	`+return {"a":str}`
	`336`	`+self.assertEqual(X.__annotate__(annotationlib.Format.VALUE), {"a":str})`
	`337`	`+self.assertEqual(annotationlib.get_annotations(X), {"a":str})`
	`338`	`+`
	`339`	`+mod=build_module(`
	`340`	`+"""`
	`341`	`+ a: int`
	`342`	`+ def __annotate__(format):`
	`343`	`+ return {"a": str}`
	`344`	`+ """`
	`345`	`+ )`
	`346`	`+self.assertEqual(mod.__annotate__(annotationlib.Format.VALUE), {"a":str})`
	`347`	`+self.assertEqual(annotationlib.get_annotations(mod), {"a":str})`
	`348`	`+`
`330`	`349`
`331`	`350`	`classDeferredEvaluationTests(unittest.TestCase):`
`332`	`351`	`deftest_function(self):`

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