[roll] Roll fuchsia Revert "[starnix][kernel] Skip zombie tracee registration for unspawned tasks"

This reverts commit 1cea1df943a9a964c61ef6f695a1bd0fdfe088e2.

Reason for revert: Reverting suspect CL due to builder failure

Failure Link: go/bbid/8676727414809643905

Original change's description:
> [starnix][kernel] Skip zombie tracee registration for unspawned tasks
>
> When a task spawned with CLONE_PTRACE fails during thread creation, it
> is cleaned up via release_on_error!(), which ultimately calls
> ThreadGroup::remove(). Because ptrace attachment occurs before thread
> spawning in execute_task(), such an aborted task already has its ptrace
> state populated.
>
> Previously, Task::set_ptrace_zombie() would register this aborted task
> as a zombie in the tracer's zombie_ptracees map. Since the tracee never
> actually ran in userspace and never delivered creation events to the
> tracer, the tracer would never reap it via waitpid(). When the tracer
> subsequently exited and dropped its ThreadGroup, this unreaped zombie
> caused a kernel panic.
>
> This change checks is_spawned() in set_ptrace_zombie(), ensuring that
> tasks failing prior to execution do not register un-reapable zombies.
>
> Linux does not have this problem because it does not attach tasks to the
> PID table or their thread group until they are fully spawned.
>
> Original-Bug: 527225621
> Multiply: ptrace_test
> Change-Id: I6208ff77b3dba534b6b1d92b460b6099dbe7594b
> Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1698658
> Reviewed-by: David Song <wintermelons@google.com>
> Commit-Queue: Jeremiah Griffin <jzgriffin@google.com>

Original-Original-Bug: 527225621
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1699802
Exempt: android-build-ayeaye@system.gserviceaccount.com <android-build-ayeaye@system.gserviceaccount.com>
Original-Original-Revision: baa69d0a16513bdc58fcad6d6a70d798f2f595e6
GitOrigin-RevId: 49ab204cdbe985a4013467b294f43d42a658b44c
Change-Id: Id6fa0cb83afffe6b80ebd66831e4e599c0342da4
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1699762
Cr-Commit-Position: refs/heads/main@{#196562}