constellation: Rename messages sent to the Constellation (#36341)

Messages that are sent to the `Constellation` have pretty ambiguous
names.
This change does two renames:

- `ConstellationMsg` → `EmbedderToConstellationMessage`
- `ScriptMsg` → `ScriptToConstellationMessage`

This naming reflects that the `Constellation` stands in between the
embedding layer and the script layer and can receive messages from both.
Soon both of these message types will live in `constellation_traits`,
reflecting the idea that the `_traits` variant for a crate is
responsible for exposing the API for that crate.

Testing: No new tests are necessary here as this just renames two enums.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

components/script/dom/serviceworker.rs

@@ -8,7 +8,7 @@ use base::id::ServiceWorkerId;
 use dom_struct::dom_struct;
 use js::jsapi::{Heap, JSObject};
 use js::rust::{CustomAutoRooter, CustomAutoRooterGuard, HandleValue};
-use script_traits::{DOMMessage, ScriptMsg};
+use script_traits::{DOMMessage, ScriptToConstellationMessage};
 use servo_url::ServoUrl;
 
 use crate::dom::abstractworker::SimpleWorkerErrorHandler;
@@ -109,13 +109,9 @@ impl ServiceWorker {
             origin: incumbent.origin().immutable().clone(),
             data,
         };
-        let _ = self
-            .global()
-            .script_to_constellation_chan()
-            .send(ScriptMsg::ForwardDOMMessage(
-                msg_vec,
-                self.scope_url.clone(),
-            ));
+        let _ = self.global().script_to_constellation_chan().send(
+            ScriptToConstellationMessage::ForwardDOMMessage(msg_vec, self.scope_url.clone()),
+        );
         Ok(())
     }
 }