test: ability to use node debugger (#56277)

Fixes ability to run `NODE_OPTIONS='--inspect' next dev` as described in
[docs](https://nextjs.org/docs/pages/building-your-application/configuring/debugging),
by removing inspect option from NODE_OPTIONS arg passed to worker
process.

This bug seem to have been introduced in
7d93808 as a part of a some
refactoring. See how `getNodeOptionsWithoutInspect` is no longer used.

Fixes #55862

---------

Co-authored-by: Jiachi Liu <inbox@huozhi.im>

test/integration/cli/test/index.test.js

@@ -530,18 +530,24 @@ describe('CLI Usage', () => {
     test("NODE_OPTIONS='--inspect'", async () => {
       const port = await findPort()
       let output = ''
+      let errOutput = ''
       const app = await runNextCommandDev(
         [dirBasic, '--port', port],
         undefined,
         {
           onStdout(msg) {
             output += stripAnsi(msg)
           },
+          onStderr(msg) {
+            errOutput += stripAnsi(msg)
+          },
           env: { NODE_OPTIONS: '--inspect' },
         }
       )
       try {
         await check(() => output, new RegExp(`http://localhost:${port}`))
+        await check(() => errOutput, /Debugger listening on/)
+        expect(errOutput).not.toContain('address already in use')
       } finally {
         await killApp(app)
       }