Loosen the APPSIGNAL_AGENT_PATH assertion

Previously, the APPSIGNAL_AGENT_PATH assertion assumed the project
directory was named nodejs, so it checked if the path ended on
`nodejs/ext`. That didn't work on my machine, so the test now only
checks if the path ends with `/ext`.

src/__tests__/config.test.ts

@@ -294,7 +294,7 @@ describe("Configuration", () => {
     })
 
     it("writes private constants to the environment", () => {
-      expect(env("_APPSIGNAL_AGENT_PATH")).toMatch(/nodejs\/ext$/)
+      expect(env("_APPSIGNAL_AGENT_PATH")).toMatch(/\/ext$/)
       expect(env("_APPSIGNAL_PROCESS_NAME")).toMatch(/node$/)
       expect(env("_APPSIGNAL_LANGUAGE_INTEGRATION_VERSION")).toEqual(
         `nodejs-${VERSION}`