test: deflake debugger function name extraction

Evaluating expressions against the running target can trigger a V8
scope assertion. Keep the target paused and wait for the initial break
before checking the function formatting. Await debugger teardown.

Signed-off-by: Filip Skokan <panva.ip@gmail.com>
Assisted-by: Codex
PR-URL: #66231
Reviewed-By: Aviv Keller <me@aviv.sh>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: panva

test/parallel/test-debugger-extract-function-name.mjs

@@ -7,14 +7,12 @@ import startCLI from '../common/debugger.js';
 
 import assert from 'assert';
 
-const env = {
-  ...process.env,
-  NODE_INSPECT_RESUME_ON_START: '1',
-};
-const cli = startCLI(
-  [fixtures.path('debugger', 'alive.js')], [], { env });
+// Evaluating while the target is running can trigger a V8 scope assertion.
+// Keep it paused for these formatting checks.
+const cli = startCLI([fixtures.path('debugger', 'three-lines.js')]);
 
 try {
+  await cli.waitForInitialBreak();
   await cli.waitForPrompt();
   await cli.command('exec a = function func() {}; a;');
   assert.match(cli.output, /\[Function: func\]/);
@@ -33,5 +31,5 @@ try {
   await cli.command('exec a = function * func() {}; a;');
   assert.match(cli.output, /\[GeneratorFunction\]/);
 } finally {
-  cli.quit();
+  await cli.quit();
 }