refactor(scheduler): move scheduler to new crate to support workflows in multiple crates (#1681)

crates/external_services/src/email.rs

@@ -102,16 +102,20 @@ impl EmailClient for AwsSes {
     }
 }
 
+#[allow(missing_docs)]
 /// Errors that could occur from EmailClient.
 #[derive(Debug, thiserror::Error)]
 pub enum EmailError {
     /// An error occurred when building email client.
     #[error("Error building email client")]
     ClientBuildingFailure,
-
     /// An error occurred when sending email
     #[error("Error sending email to recipient")]
     EmailSendingFailure,
+    #[error("Failed to generate email token")]
+    TokenGenerationFailure,
+    #[error("Feature not implemented")]
+    NotImplemented,
 }
 
 /// Errors that could occur during SES operations.