Test | Fix XmlReader Test on ARM

`DataStreamTest.ExecuteXmlReaderTest` fails on ARM (and only on ARM, but both, NET462 and NET8) with:

```
[xUnit.net 00:02:15.08] Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.RunAllTestsForSingleServer_TCP [FAIL]
[xUnit.net 00:02:15.08] FAILED: Actual XML results differed from expected value.
Expected: (System.String)
Actual: (System.String)
[xUnit.net 00:02:15.08] Expected: True
[xUnit.net 00:02:15.08] Actual: False
[xUnit.net 00:02:15.08] Stack Trace:
[xUnit.net 00:02:15.08] /_/src/Microsoft.Data.SqlClient/tests/ManualTests/DataCommon/DataTestUtility.cs(724,0): at Microsoft.Data.SqlClient.ManualTesting.Tests.DataTestUtility.AssertEqualsWithDescription(Object expectedValue, Object actualValue, String failMessage)
[xUnit.net 00:02:15.08] /_/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataStreamTest/DataStreamTest.cs(796,0): at Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.ExecuteXmlReaderTest(String connectionString)
[xUnit.net 00:02:15.08] /_/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataStreamTest/DataStreamTest.cs(168,0): at Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.RunAllTestsForSingleServer(String connectionString, Boolean usingNamePipes)
[xUnit.net 00:02:15.08] /_/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataStreamTest/DataStreamTest.cs(38,0): at Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.RunAllTestsForSingleServer_TCP()
Failed Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.RunAllTestsForSingleServer_TCP [2 s]
##[error]EXEC(0,0): Error Message:
EXEC : error Message: [D:\a\_work\1\s\build.proj]
FAILED: Actual XML results differed from expected value.
Expected: (System.String)
Actual: (System.String)
Expected: True
Actual: False
Stack Trace:
at Microsoft.Data.SqlClient.ManualTesting.Tests.DataTestUtility.AssertEqualsWithDescription(Object expectedValue, Object actualValue, String failMessage) in /_/src/Microsoft.Data.SqlClient/tests/ManualTests/DataCommon/DataTestUtility.cs:line 724
at Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.ExecuteXmlReaderTest(String connectionString) in /_/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataStreamTest/DataStreamTest.cs:line 796
at Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.RunAllTestsForSingleServer(String connectionString, Boolean usingNamePipes) in /_/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataStreamTest/DataStreamTest.cs:line 168
at Microsoft.Data.SqlClient.ManualTesting.Tests.DataStreamTest.RunAllTestsForSingleServer_TCP() in /_/src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataStreamTest/DataStreamTest.cs:line 38
```

The test is currently disabled with an ActiveIssue "5540", would be great to get the description for this from Azure DevOps