Fix tool filtering to work off mcp tool attribute name, not method name

[benbp]

Fix tool filtering to work off the mcp tool attribute name, not the C# method name.

The GetCommand method is going to change slightly after #12564 goes in, but the core logic change to tool filtering is the same so I figured I'd get this up for review.

⇉ ⇉ ⇉ dotnet run --no-restore -- mcp  --tools '*hello*'
...
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://127.0.0.1:36615
...

{"jsonrpc":"2.0","id":3,"method":"tools/list","params":{}}

info: ModelContextProtocol.Server.McpServer[570385771]
      Server (azsdk 0.5.3.0) method 'tools/list' request handler called.
info: ModelContextProtocol.Server.McpServer[1867955179]
      Server (azsdk 0.5.3.0) method 'tools/list' request handler completed.

{"result":{"tools":[{"name":"azsdk_hello_world","description":"Echoes the message back to the client","inputSchema":{"type":"object","properties":{"message":{"type":"string"}},"required":[
"message"]}},{"name":"azsdk_hello_world_fail","description":"Echoes the message back to the client with a failure","inputSchema":{"type":"object","properties":{"message":{"type":"string"}}
,"required":["message"]}}]},"id":3,"jsonrpc":"2.0"}

[Copilot]

Pull Request Overview

This PR fixes the tool filtering mechanism in the MCP (Model Context Protocol) server to filter based on the McpServerToolAttribute.Name property rather than the method name. This ensures that tools are correctly matched against user-specified patterns regardless of the underlying method naming.

Key Changes:

• Moved tool filtering logic from type-level to method-level within RegisterInstrumentedMcpTools
• Removed the GetFilteredToolTypes method that was filtering by type name
• Added ToolOption to the host server command to support tool filtering at runtime

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
ServiceRegistrations.cs	Implements method-level filtering using McpServerToolAttribute.Name instead of type-based filtering
SharedOptions.cs	Removes the now-obsolete GetFilteredToolTypes method that filtered by type name
HostServerCommand.cs	Adds ToolOption to enable tool filtering for the MCP server command
CommandRunner.cs	Simplifies tool type retrieval by removing the call to GetFilteredToolTypes