[PS-40] Upgrade to .NET 6 (#2056)

* Bump to .NET 6

* Update Docker images

* Update docs

* Update workflow for linter

* Add all common versions to props file

* Update tools manifest

* Update csproj files

* Update packages.lock.json files

* Switch to setup-dotnet

* Remove msbuild

* Fix deps breaking changes

* Manually install msbuild

* Use msbuild for build

* Fix verbosity switch

* Remove unused exceptions

* Address linter feedback

* Make Obsolete warnings suggestions for now.

* Force Evaluate

* Format on tests

* Run formatting again.

* Use windows 2022

* force evaluate

* Fix restore

* Fix linter

* Skip test

* Update Directory.Build.props

Co-authored-by: Matt Gibson <mgibson@bitwarden.com>

* Address PR feedback

* Add IntegationTest for Rate limiter

* Fix test

* Reenable test

* Reorder test

* Skip test again

* Add tracking link

* Update .github/workflows/build.yml

Co-authored-by: Micaiah Martin <77340197+mimartin12@users.noreply.github.com>

Co-authored-by: Matt Gibson <mgibson@bitwarden.com>
Co-authored-by: Micaiah Martin <77340197+mimartin12@users.noreply.github.com>

util/PostgresMigrations/PostgresMigrations.csproj

@@ -1,16 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-  <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
-  </PropertyGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\..\src\Core\Core.csproj" />
     <ProjectReference Include="..\..\src\Api\Api.csproj" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.9">
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.4">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>