Make nullable warnings a per file opt-in (#1842)

* Make nullable warnings a per file opt-in

* Remove unneeded compiler directives

* Remove compiler directive for User Data

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/DataStorage/SaveAsCsvFileStreamWriterTests.cs

@@ -3,6 +3,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+#nullable disable
+
 using System;
 using System.IO;
 using System.Linq;

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/DataStorage/SaveAsJsonFileStreamWriterTests.cs

@@ -3,6 +3,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/DataStorage/SaveAsMarkdownFileStreamWriterTests.cs

@@ -3,6 +3,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/DataStorage/SaveAsXmlFileStreamWriterTests.cs

@@ -3,6 +3,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+#nullable disable
+
 using System;
 using System.IO;
 using System.Text;

test/Microsoft.SqlTools.ServiceLayer.UnitTests/QueryExecution/DataStorage/ServiceBufferFileStreamReaderWriterTests.cs

@@ -3,6 +3,8 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 //
 
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Data.SqlTypes;
@@ -157,10 +159,10 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
         
         
         public void Int16([Values(
-            0,
-            10,
-            -10,
-            short.MaxValue,    // Two byte number
+            0,
+            10,
+            -10,
+            short.MaxValue,    // Two byte number
             short.MinValue    // Negative two byte number
             )] short value)
         {
@@ -169,10 +171,10 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
 
         [Test]
         public void Int32([Values(
-            0,
-            10,
-            -10,
-            short.MaxValue,    // Two byte number
+            0,
+            10,
+            -10,
+            short.MaxValue,    // Two byte number
             short.MinValue,    // Negative two byte number
             int.MaxValue, // Four byte number
             int.MinValue  // Negative four byte number
@@ -183,10 +185,10 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
 
         [Test]
         public void Int64([Values(
-            0,
-            10,
-            -10,
-            short.MaxValue,    // Two byte number
+            0,
+            10,
+            -10,
+            short.MaxValue,    // Two byte number
             short.MinValue,    // Negative two byte number
             int.MaxValue, // Four byte number
             int.MinValue,  // Negative four byte number
@@ -236,12 +238,12 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
 
         [Test]        
         public void Single([Values(
-            0,
-            10.1F,
-            -10.1F,
-            float.MinValue,
-            float.MaxValue,
-            float.PositiveInfinity,
+            0,
+            10.1F,
+            -10.1F,
+            float.MinValue,
+            float.MaxValue,
+            float.PositiveInfinity,
             float.NegativeInfinity
             )] float value)
         {
@@ -250,16 +252,16 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
 
         [Test]
         public void Double([Values(
-            0,
-            10.1,
-            -10.1,
-            float.MinValue,
-            float.MaxValue,
-            float.PositiveInfinity,
+            0,
+            10.1,
+            -10.1,
+            float.MinValue,
+            float.MaxValue,
+            float.PositiveInfinity,
             float.NegativeInfinity,
-            double.PositiveInfinity,
-            double.NegativeInfinity,
-            double.MinValue,
+            double.PositiveInfinity,
+            double.NegativeInfinity,
+            double.MinValue,
             double.MaxValue
             )]double value)
         {
@@ -577,11 +579,11 @@ namespace Microsoft.SqlTools.ServiceLayer.UnitTests.QueryExecution.DataStorage
         [Test]
         public void GuidTest()
         {
-            foreach (var testValue in GuidTestParameters)
-            {
-                VerifyReadWrite(testValue.ToByteArray().Length + 1, testValue,
-                    (writer, val) => writer.WriteGuid(testValue),
-                    (reader, rowId) => reader.ReadGuid(0, rowId));
+            foreach (var testValue in GuidTestParameters)
+            {
+                VerifyReadWrite(testValue.ToByteArray().Length + 1, testValue,
+                    (writer, val) => writer.WriteGuid(testValue),
+                    (reader, rowId) => reader.ReadGuid(0, rowId));
             }
         }