fix: update texts on mcp component and tab, fix icons not updating (#7850)

* Update texts about mcp

* Change generic icon when name changes

* Remove unused imports

* Updated tests

src/backend/base/langflow/components/tools/mcp_component.py

@@ -77,8 +77,8 @@ class MCPToolsComponent(Component):
         "headers_input",
     ]
 
-    display_name = "MCP Server"
-    description = "Connect to an MCP server and expose tools."
+    display_name = "MCP Connection"
+    description = "Connect to an MCP server to use its tools."
     icon = "Mcp"
     name = "MCPTools"