Fix unawaited async Task tests by changing to void

Author: andyleejordan

test/PowerShellEditorServices.Test/Language/SemanticTokenTest.cs

@@ -17,7 +17,7 @@ namespace Microsoft.PowerShell.EditorServices.Test.Language
     public class SemanticTokenTest
     {
         [Fact]
-        public async Task TokenizesFunctionElements()
+        public void TokenizesFunctionElements()
         {
             string text = @"
 function Get-Sum {
@@ -59,7 +59,7 @@ function Get-Sum {
         }
 
         [Fact]
-        public async Task TokenizesStringExpansion()
+        public void TokenizesStringExpansion()
         {
             string text = "Write-Host \"$(Test-Property Get-Whatever) $(Get-Whatever)\"";
             ScriptFile scriptFile = new ScriptFile(
@@ -82,7 +82,7 @@ public async Task TokenizesStringExpansion()
         }
 
         [Fact]
-        public async Task RecognizesTokensWithAsterisk()
+        public void RecognizesTokensWithAsterisk()
         {
             string text = @"
 function Get-A*A {
@@ -111,7 +111,7 @@ function Get-A*A {
         }
 
         [Fact]
-        public async Task RecognizesArrayPropertyInExpandableString()
+        public void RecognizesArrayPropertyInExpandableString()
         {
             string text = "\"$(@($Array).Count) OtherText\"";
             ScriptFile scriptFile = new ScriptFile(
@@ -136,7 +136,7 @@ public async Task RecognizesArrayPropertyInExpandableString()
         }
 
         [Fact]
-        public async Task RecognizesCurlyQuotedString()
+        public void RecognizesCurlyQuotedString()
         {
             string text = "“^[-'a-z]*”";
             ScriptFile scriptFile = new ScriptFile(
@@ -150,7 +150,7 @@ public async Task RecognizesCurlyQuotedString()
         }
 
         [Fact]
-        public async Task RecognizeEnum()
+        public void RecognizeEnum()
         {
             string text =  @"
 enum MyEnum{

test/PowerShellEditorServices.Test/Session/PowerShellContextTests.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using System.Management.Automation;
 using System.Runtime.InteropServices;
@@ -149,7 +148,7 @@ await this.powerShellContext.ExecuteCommandAsync<string>(
 
         [Trait("Category", "PSReadLine")]
         [SkippableFact]
-        public async Task CanGetPSReadLineProxy()
+        public void CanGetPSReadLineProxy()
         {
             Skip.If(IsWindows, "This test doesn't work on Windows for some reason.");
             Assert.True(PSReadLinePromptContext.TryGetPSReadLineProxy(