fix(webapp): surface promote/rollback action errors on the form

The deployment promote and rollback actions assigned errors to a runParam
field that does not exist in their form schema (copied from the run routes),
so Conform never rendered them. Use the root-level error key instead.

Author: matt-aitken

apps/webapp/app/routes/resources.$projectId.deployments.$deploymentShortCode.promote.ts

@@ -93,11 +93,11 @@ export const action = dashboardAction(
             stack: error.stack,
           },
         });
-        submission.error = { runParam: [error.message] };
+        submission.error = { "": [error.message] };
         return json(submission);
       } else {
         logger.error("Failed to promote deployment", { error });
-        submission.error = { runParam: [JSON.stringify(error)] };
+        submission.error = { "": [JSON.stringify(error)] };
         return json(submission);
       }
     }

apps/webapp/app/routes/resources.$projectId.deployments.$deploymentShortCode.rollback.ts

@@ -93,11 +93,11 @@ export const action = dashboardAction(
             stack: error.stack,
           },
         });
-        submission.error = { runParam: [error.message] };
+        submission.error = { "": [error.message] };
         return json(submission);
       } else {
         logger.error("Failed to roll back deployment", { error });
-        submission.error = { runParam: [JSON.stringify(error)] };
+        submission.error = { "": [JSON.stringify(error)] };
         return json(submission);
       }
     }