Quarantine identity test (#20373)

https://dev.azure.com/dnceng/public/_build/results?buildId=580722&view=ms.vss-test-web.build-test-results-tab&runId=18259416&resultId=108224&paneView=debug

src/Identity/test/Identity.Test/IdentityUIScriptsTest.cs

@@ -40,6 +40,7 @@ namespace Microsoft.AspNetCore.Identity.Test
 
         [Theory]
         [MemberData(nameof(ScriptWithIntegrityData))]
+        [QuarantinedTest]
         public async Task IdentityUI_ScriptTags_SubresourceIntegrityCheck(ScriptTag scriptTag)
         {
             var integrity = await GetShaIntegrity(scriptTag);