debugger beta: Auto download Delve (Go's DAP) & fix grammar errors in docs (#31273)

Release Notes:

- debugger beta: Go's debug adapter will now automatically download if
not found on user's PATH

Co-authored-by: Remco Smits <djsmits12@gmail.com>

crates/dap_adapters/src/codelldb.rs

@@ -339,9 +339,6 @@ impl DebugAdapter for CodeLldbDebugAdapter {
                             },
                             {
                                 "required": ["targetCreateCommands"]
-                            },
-                            {
-                                "required": ["cargo"]
                             }
                         ]
                     }