Set IsPackable to false in example projects

Added <IsPackable>false</IsPackable> to the Console and Plugin example .csproj files to prevent these projects from being packaged. This helps ensure only intended projects are distributed as NuGet packages.

Author: ChrisPulman

src/Extensions.Hosting.Console.Example/Extensions.Hosting.Console.Example.csproj

@@ -7,6 +7,7 @@
     <IsTransformWebConfigDisabled>true</IsTransformWebConfigDisabled>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>

src/Extensions.Hosting.Plugin.Example/ReactiveMarbles.Plugin.Example.csproj

@@ -4,6 +4,7 @@
     <TargetFrameworks>net9.0;net48</TargetFrameworks>
     <Platforms>AnyCPU;x64</Platforms>
     <OutputPath>..\Extensions.Hosting.Console.Example\bin\$(Configuration)\$(TargetFramework)\Plugins\</OutputPath>
+    <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>