refactor(gateway): use policy swap class for deletes

Author: aidandaly24

src/core/gateway.tsx

@@ -261,15 +261,10 @@ export class GatewayClient implements CoreGatewayClient {
     if (!role) return response;
 
     const configurations = await listTargetRoleConfigurations(control, gatewayId, targetId);
-    return swapInlinePolicyForOperation(
-      iam,
-      {
-        roleName: role.roleName,
-        policyNamePrefix: GATEWAY_EXECUTION_POLICY_NAME,
-        policyDocument: role.candidatePolicyDocument(configurations),
-      },
-      async () => response,
-    );
+    return new InlinePolicySwap(iam, {
+      roleName: role.roleName,
+      policyNamePrefix: GATEWAY_EXECUTION_POLICY_NAME,
+    }).run(role.candidatePolicyDocument(configurations), async () => response);
   }
 
   async getGatewayRule(