Scope MCP9005 suppression to samples that use deprecated APIs

Replace the blanket samples/Directory.Build.props suppression with a
local NoWarn in only the four samples that intentionally exercise a
deprecated feature, so MCP9005 stays active for every other sample.

Author: Tarek Mahmoud Sayed

samples/AspNetCoreMcpServer/AspNetCoreMcpServer.csproj

@@ -5,6 +5,9 @@
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <PublishAot>true</PublishAot>
+    <!-- This sample demonstrates the Sampling feature, which SEP-2577 deprecates (MCP9005) but
+         which continues to work. Suppress the deprecation warning for this sample only. -->
+    <NoWarn>$(NoWarn);MCP9005</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>

samples/ChatWithTools/ChatWithTools.csproj

@@ -5,6 +5,9 @@
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <!-- This sample demonstrates the Sampling feature, which SEP-2577 deprecates (MCP9005) but
+         which continues to work. Suppress the deprecation warning for this sample only. -->
+    <NoWarn>$(NoWarn);MCP9005</NoWarn>
     <!--
     Anthropic SDK isn't AOT compatible yet
     <PublishAot>true</PublishAot>

samples/Directory.Build.props

@@ -5,6 +5,9 @@
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <OutputType>Exe</OutputType>
+    <!-- This sample demonstrates the Logging and Sampling features, which SEP-2577 deprecates
+         (MCP9005) but which continue to work. Suppress the deprecation warning for this sample only. -->
+    <NoWarn>$(NoWarn);MCP9005</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>

samples/EverythingServer/EverythingServer.csproj

@@ -6,6 +6,9 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <PublishAot Condition="'$(TargetFramework)' == 'net9.0'">true</PublishAot>
+    <!-- This sample demonstrates the Sampling feature, which SEP-2577 deprecates (MCP9005) but
+         which continues to work. Suppress the deprecation warning for this sample only. -->
+    <NoWarn>$(NoWarn);MCP9005</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>