debugger: preserve overlapping CDP request state

A Debugger.paused event can arrive before the response to the resume
request that triggered it. The resulting probe evaluation replaces the
resume request in `inFlight`, but the resume cleanup then clears the
newer request's state.

Only clear `inFlight` when it still refers to the request being
completed. This preserves probe attribution when the target exits
during evaluation. Clarify the existing end-to-end test coverage
for this case.

Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.6-sol
PR-URL: #64467
Refs: https://github.com/nodejs/reliability/issues?q=sort%3Aupdated-desc%20test-debugger-probe-failure-process-exit
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: trivikr

lib/internal/debugger/inspect_probe.js

@@ -750,7 +750,8 @@ class ProbeInspectorSession {
 
   async callCdp(method, params, probe = null) {
     if (this.finished) { throw kInspectorFailedSentinel; }
-    this.inFlight = { __proto__: null, method, probe };
+    const request = { __proto__: null, method, probe };
+    this.inFlight = request;
     debug('CDP -> %s%s', method, probe !== null ? `, probe=${probe.index}` : '');
     try {
       const result = await this.client.callMethod(method, params);
@@ -806,7 +807,9 @@ class ProbeInspectorSession {
       }
       throw kInspectorFailedSentinel;
     } finally {
-      this.inFlight = null;
+      if (this.inFlight === request) {
+        this.inFlight = null;
+      }
     }
   }