Running --dev with no --config doesn't enable dev mode

[abernix]

Reproduction

1. Use Starstuff as starstuff.graphql
2. Run

   ./router --supergraph starstuff.graphql --dev
   

Observed Behavior

INFO Apollo Router v1.0.0-rc.0 // (c) Apollo Graph, Inc. // Licensed as ELv2 (https://go.apollo.dev/elv2)
INFO GraphQL endpoint exposed at http://127.0.0.1:4000/ 🚀

Expected Behavior

INFO Apollo Router v1.0.0-rc.0 // (c) Apollo Graph, Inc. // Licensed as ELv2 (https://go.apollo.dev/elv2)
WARN Development mode has been enabled and has not been started by `rover dev`. This mode of operation is only meant for development!
INFO enabled plugins: ["apollo.include_subgraph_errors", "apollo.csrf", "apollo.telemetry", "experimental.expose_query_plan"]

Currently, the implementation of ConfigurationSource only accepts dev on ConfigurationSource::File:

router/apollo-router/src/router.rs

Lines 241 to 270 in cf97c47

	pub enum ConfigurationSource {
	/// A static configuration.
	///
	/// Can be created through `serde::Deserialize` from various formats,
	/// or inline in Rust code with `serde_json::json!` and `serde_json::from_value`.
	#[display(fmt = "Static")]
	#[from(types(Configuration))]
	Static(Box<Configuration>),
	/// A configuration stream where the server will react to new configuration. If possible
	/// the configuration will be applied without restarting the internal http server.
	#[display(fmt = "Stream")]
	Stream(#[derivative(Debug = "ignore")] ConfigurationStream),
	/// A yaml file that may be watched for changes
	#[display(fmt = "File")]
	File {
	/// The path of the configuration file.
	path: PathBuf,
	/// `true` to watch the file for changes and hot apply them.
	watch: bool,
	/// When watching, the delay to wait before applying the new configuration.
	delay: Option<Duration>,
	/// `true` if dev mode is enabled
	dev: bool,
	},
	}

and even more specifically...

router/apollo-router/src/router.rs

Lines 267 to 268 in cf97c47

	/// `true` if dev mode is enabled
	dev: bool,

This is probably my mistake for leaning into this pattern I started with in #1748 (which I cargo culted from #1475) which I handed off to @bnjjj.