test: fix flaky test-inspector-connect-main-thread

Using `console.log()` likely interferes with the functionality of the
test, which also checks the interaction between inspector
and `console.log()` as part of the test. Using `process._rawDebug()`
solves that issue.

Refs: nodejs#28870
Refs: nodejs#29582

test/parallel/test-inspector-connect-main-thread.js

@@ -27,10 +27,10 @@ async function post(session, method, params) {
     session.post(method, params, (error, success) => {
       messagesSent.push(method);
       if (error) {
-        console.log(`Message ${method} produced an error`);
+        process._rawDebug(`Message ${method} produced an error`);
         reject(error);
       } else {
-        console.log(`Message ${method} was sent`);
+        process._rawDebug(`Message ${method} was sent`);
         resolve(success);
       }
     });