Add old endpoint as alias for backward compatibility

Author: vermakhushboo

app/http.php

@@ -690,6 +690,7 @@ function removeAllRuntimes(Table $activeRuntimes, Orchestration $orchestration):
     });
 
 Http::post('/v1/runtimes/:runtimeId/executions')
+    ->alias('/v1/runtimes/:runtimeId/execution')
     ->desc('Create an execution')
     // Execution-related
     ->param('runtimeId', '', new Text(64), 'The runtimeID to execute.')