Improving performance of Adding and Removing Packaged Apps (#4521) (#4900) (#4901)

* Merging in Theme changes and moving win32Tests to Microsoft.Plugin.Program.UnitTests

* Fixing message format for exception

* Changing test structure.  Need to add unit tests.

* Updating packagerepository comment based on pr feedback

* Fixing potential race condition in ListRepository.  Now internally implemented as a concurrent dictionary.

* Removing unecessary implementation of IRepository interface as this is implemented by the base class.

* Restoring checks for invalid uwp apps based on PR feedback. This was accidentally removed when moving the initialize outside the constructor.

* Fixing comments

* Adding newline to end of file for IProgramRepository

Author: ryanbodrug-microsoft

PowerToys.sln

@@ -255,6 +255,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "KeyboardManagerTest", "src\
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ManagedCommon", "src\common\ManagedCommon\ManagedCommon.csproj", "{4AED67B6-55FD-486F-B917-E543DEE2CB3C}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.Plugin.Program.UnitTests", "src\modules\launcher\Plugins\Microsoft.Plugin.Program.UnitTests\Microsoft.Plugin.Program.UnitTests.csproj", "{42851751-CBC8-45A6-97F5-7A0753F7B4D1}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -501,6 +503,10 @@ Global
 		{4AED67B6-55FD-486F-B917-E543DEE2CB3C}.Debug|x64.Build.0 = Debug|x64
 		{4AED67B6-55FD-486F-B917-E543DEE2CB3C}.Release|x64.ActiveCfg = Release|x64
 		{4AED67B6-55FD-486F-B917-E543DEE2CB3C}.Release|x64.Build.0 = Release|x64
+		{42851751-CBC8-45A6-97F5-7A0753F7B4D1}.Debug|x64.ActiveCfg = Debug|x64
+		{42851751-CBC8-45A6-97F5-7A0753F7B4D1}.Debug|x64.Build.0 = Debug|x64
+		{42851751-CBC8-45A6-97F5-7A0753F7B4D1}.Release|x64.ActiveCfg = Release|x64
+		{42851751-CBC8-45A6-97F5-7A0753F7B4D1}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -571,6 +577,7 @@ Global
 		{E6410BFC-B341-498C-8C67-312C20CDD8D5} = {1AFB6476-670D-4E80-A464-657E01DFF482}
 		{62173D9A-6724-4C00-A1C8-FB646480A9EC} = {38BDB927-829B-4C65-9CD9-93FB05D66D65}
 		{4AED67B6-55FD-486F-B917-E543DEE2CB3C} = {1AFB6476-670D-4E80-A464-657E01DFF482}
+		{42851751-CBC8-45A6-97F5-7A0753F7B4D1} = {4AFC9975-2456-4C70-94A4-84073C1CED93}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {C3A2F9D1-7930-4EF4-A6FC-7EE0A99821D0}

src/modules/launcher/Plugins/Microsoft.Plugin.Program.UnitTests/Microsoft.Plugin.Program.UnitTests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+
+    <Platforms>x64</Platforms>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <PlatformTarget>x64</PlatformTarget>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Moq" Version="4.14.3" />
+    <PackageReference Include="nunit" Version="3.12.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.15.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Microsoft.Plugin.Program\Microsoft.Plugin.Program.csproj" />
+  </ItemGroup>
+
+</Project>