Refactor `templateVersionDynamicParameters` to remove control flag and send websocket errors

This code currently operates with a control flag `listen`

https://github.com/coder/coder/blob/ae827703d8f75ebc77f07f436ad3200f48fa2ed1/coderd/parameters.go#L71-L112

This requires a `nolint` and should be fixed. Additionally, http errors are not well received by websocket based FE requests. These errors should be translated to the websocket message to be properly rendered on the FE.