cleanup magic string (cn in local is different from ci)

Author: apietroni51

test/e2e/tls_connection.test.ts

@@ -5,11 +5,13 @@ import { Connection } from "../../src/connection.js"
 import { readFile } from "fs/promises"
 
 describe("TLS Connection", () => {
+  const LOCAL_TEST_CN = "rabbitmq"
+  
   let environment: Environment
   let connection: Connection
 
   test("creating a TLS connection", async () => {
-    const cn = process.env.CN ?? "rabbitmq"
+    const cn = process.env.CN ?? LOCAL_TEST_CN
     const tls = {
       ca: await readFile("./tls-gen/basic/result/ca_certificate.pem", "utf8"),
       cert: await readFile(`./tls-gen/basic/result/client_${cn}_certificate.pem`, "utf8"),