[roll] Roll fuchsia Revert "Reland "[test_manager] enable debug_agent backtrace""

This reverts commit d5552362cf1fe51e0125f390a1da8845976f8b10.

Reason for revert: Tripping on https://cs.opensource.google/fuchsia/fuchsia/+/main:src/lib/elflib/elflib.cc;l=269

Original change's description:
> Reland "[test_manager] enable debug_agent backtrace"
>
> This reverts commit f6041fc4e9364dcf15f50176d619ea05d36831c9.
>
> Reason for revert: fixed test_manager to abide by `no_exception_channel`.
>
> Original change's description:
> > Revert "[test_manager] enable debug_agent backtrace"
> >
> > This reverts commit f397837ac8e3b4c4990e85c16be5821749a3e749.
> >
> > Reason for revert: Possibly broke job-with-available-exception-channel-test
> >
> > Original-Bug: 385008705
> >
> > Original change's description:
> > > [test_manager] enable debug_agent backtrace
> > >
> > > This CL turns on test_managers integration of debug_agent, which causes
> > > a backtrace to be sent to stderr when a test panics. This backtrace
> > > is displayed in fx test output and is available in test output
> > > artifacts.
> > >
> > > Currently, when a rust test fails, we see two stack traces, because the
> > > rust runtime also dumps the backtrace.
> > >
> > > Test: feature is covered by current unit tests
> > >
> > > Original-Fixed: 286555768
> > > Change-Id: I4c45c6746d4476d3d8c4e432578c2b408b75ae8b
> > > Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1152601
> > > Reviewed-by: Jacob Rutherford <jruthe@google.com>
> > > Commit-Queue: Dale Sather <dalesat@google.com>
> >
> > Change-Id: I77544afb4ce948b48c93b253e52ed8cd1ba2a186
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1177553
> > Reviewed-by: RubberStamper 🤖 <android-build-ayeaye@system.gserviceaccount.com>
> > Commit-Queue: Yilong Li <liyl@google.com>
>
> Original-Bug: 385008705
> Change-Id: I0f614c338895f3dbd245a36acba2a4c4ccaf75d8
> Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1177354
> Reviewed-by: Yilong Li <liyl@google.com>
> Fuchsia-Auto-Submit: Jacob Rutherford <jruthe@google.com>
> Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
> Reviewed-by: Dale Sather <dalesat@google.com>

Original-Bug: 385008705
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1177301
Original-Revision: b6a7bbae5c36068002169ac6a39c7b5b11dce531
GitOrigin-RevId: f62cca2ed5908ac086171f2e64fc87bc676beb8d
Change-Id: I7aa4e7e326e41546a038b0a59d30921025c3f40b