[AppConfig] Fix integration test failure (Azure#19867)

in Azure#19713, this test (package.spec.ts) was moved into `node` sub folder, and the
relative path is updated for the `unit-test` case but not the `integration-test`
case, thus causing integration test failure.

This PR fixes the relative path for integration test too.

Author: jeremymeng

sdk/appconfiguration/app-configuration/test/internal/node/package.spec.ts

@@ -19,12 +19,12 @@ describe("packagejson related tests", () => {
     try {
       // For integration tests
       packageJsonContents = JSON.parse(
-        fs.readFileSync(path.join(__dirname, "../../../package.json"), { encoding: "utf-8" })
+        fs.readFileSync(path.join(__dirname, "../../../../package.json"), { encoding: "utf-8" })
       );
     } catch (e) {
       // For unit tests
       packageJsonContents = JSON.parse(
-        fs.readFileSync(path.join(__dirname, "../../package.json"), { encoding: "utf-8" })
+        fs.readFileSync(path.join(__dirname, "../../../package.json"), { encoding: "utf-8" })
       );
     }