.NET: Move deep research sample (microsoft#2094)

* move catalog samples to the HostedAgents folder

* move the catalog samples' projects to the HostedAgents folder

* move deep research sample out of the HostedAgents folder

Author: SergeyMenshykh

dotnet/agent-framework-dotnet.slnx

@@ -63,6 +63,7 @@
     <Project Path="samples/GettingStarted/Agents/Agent_Step15_Plugins/Agent_Step15_Plugins.csproj" />
     <Project Path="samples/GettingStarted/Agents/Agent_Step16_ChatReduction/Agent_Step16_ChatReduction.csproj" />
     <Project Path="samples/GettingStarted/Agents/Agent_Step17_BackgroundResponses/Agent_Step17_BackgroundResponses.csproj" />
+    <Project Path="samples/GettingStarted/Agents/Agent_Step18_DeepResearch/Agent_Step18_DeepResearch.csproj" />
   </Folder>
   <Folder Name="/Samples/GettingStarted/DevUI/">
     <File Path="samples/GettingStarted/DevUI/README.md" />
@@ -161,7 +162,6 @@
   <Folder Name="/Samples/HostedAgents/">
     <Project Path="samples/HostedAgents/AgentsInWorkflows/AgentsInWorkflows.csproj" />
     <Project Path="samples/HostedAgents/AgentWithTextSearchRag/AgentWithTextSearchRag.csproj" />
-    <Project Path="samples/HostedAgents/DeepResearchAgent/DeepResearchAgent.csproj" />
   </Folder>
   <Folder Name="/Solution Items/">
     <File Path=".editorconfig" />

…epResearchAgent/DeepResearchAgent.csproj …esearch/Agent_Step18_DeepResearch.csprojdotnet/samples/HostedAgents/DeepResearchAgent/DeepResearchAgent.csproj renamed to dotnet/samples/GettingStarted/Agents/Agent_Step18_DeepResearch/Agent_Step18_DeepResearch.csproj dotnet/samples/HostedAgents/DeepResearchAgent/DeepResearchAgent.csproj renamed to dotnet/samples/GettingStarted/Agents/Agent_Step18_DeepResearch/Agent_Step18_DeepResearch.csproj

@@ -14,7 +14,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\..\..\src\Microsoft.Agents.AI.AzureAI.Persistent\Microsoft.Agents.AI.AzureAI.Persistent.csproj" />
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.AzureAI.Persistent\Microsoft.Agents.AI.AzureAI.Persistent.csproj" />
   </ItemGroup>
 
 </Project>

…ostedAgents/DeepResearchAgent/Program.cs …nts/Agent_Step18_DeepResearch/Program.csdotnet/samples/HostedAgents/DeepResearchAgent/Program.cs renamed to dotnet/samples/GettingStarted/Agents/Agent_Step18_DeepResearch/Program.cs dotnet/samples/HostedAgents/DeepResearchAgent/Program.cs renamed to dotnet/samples/GettingStarted/Agents/Agent_Step18_DeepResearch/Program.cs

@@ -44,6 +44,7 @@ Before you begin, ensure you have the following prerequisites:
 |[Using plugins with an agent](./Agent_Step15_Plugins/)|This sample demonstrates how to use plugins with an agent|
 |[Reducing chat history size](./Agent_Step16_ChatReduction/)|This sample demonstrates how to reduce the chat history to constrain its size, where chat history is maintained locally|
 |[Background responses](./Agent_Step17_BackgroundResponses/)|This sample demonstrates how to use background responses for long-running operations with polling and resumption support|
+|[Deep research with an agent](./Agent_Step18_DeepResearch/)|This sample demonstrates how to use the Deep Research Tool to perform comprehensive research on complex topics|
 
 ## Running the samples from the console