fix: reset stale execution state after SIGUSR1 in-process restart (#15195)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 676f9ec451
Co-authored-by: joeykrug <5925937+joeykrug@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

src/process/restart-recovery.ts

@@ -0,0 +1,16 @@
+/**
+ * Returns an iteration hook for in-process restart loops.
+ * The first call is considered initial startup and does nothing.
+ * Each subsequent call represents a restart iteration and invokes `onRestart`.
+ */
+export function createRestartIterationHook(onRestart: () => void): () => boolean {
+  let isFirstIteration = true;
+  return () => {
+    if (isFirstIteration) {
+      isFirstIteration = false;
+      return false;
+    }
+    onRestart();
+    return true;
+  };
+}