enable custom forms no labels (Azure#21233)

Author: maririos

sdk/formrecognizer/Azure.AI.FormRecognizer/tests/FormRecognizerClient/RecognizeCustomFormsLiveTests.cs

@@ -351,7 +351,6 @@ public async Task StartRecognizeCustomFormsWithLabelsCanParseDifferentTypeOfForm
         /// Recognizer cognitive service and perform analysis based on a custom labeled model.
         /// </summary>
         [RecordedTest]
-        [Ignore("https://github.com/Azure/azure-sdk-for-net/issues/20960")]
         [TestCase(true, true)]
         [TestCase(true, false)]
         [TestCase(false, true)]
@@ -414,7 +413,6 @@ public async Task StartRecognizeCustomFormsWithoutLabels(bool useStream, bool in
         }
 
         [RecordedTest]
-        [Ignore("https://github.com/Azure/azure-sdk-for-net/issues/20960")]
         [TestCase(true)]
         [TestCase(false, Ignore = "https://github.com/Azure/azure-sdk-for-net/issues/12319")]
         public async Task StartRecognizeCustomFormsWithoutLabelsCanParseMultipageForm(bool useStream)
@@ -505,7 +503,6 @@ public async Task StartRecognizeCustomFormsWithoutLabelsCanParseBlankPage()
         }
 
         [RecordedTest]
-        [Ignore("https://github.com/Azure/azure-sdk-for-net/issues/20960")]
         [TestCase(true)]
         [TestCase(false, Ignore = "https://github.com/Azure/azure-sdk-for-net/issues/12319")]
         public async Task StartRecognizeCustomFormsWithoutLabelsCanParseMultipageFormWithBlankPage(bool useStream)