possible flaky test: ffi_tracing

[zachschuermann]

failed on windows. CI run (and pasted below): https://github.com/delta-io/delta-kernel-rs/actions/runs/13813466952/job/38640519572?pr=713

failures:

---- ffi_tracing::tests::info_logs_with_log_line_tracing stdout ----

thread 'ffi_tracing::tests::info_logs_with_log_line_tracing' panicked at ffi\src\ffi_tracing.rs:508:21:
assertion failed: got.contains(tstr)
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src\panicking.rs:692
   1: core::panicking::panic_fmt
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\panicking.rs:75
   2: core::panicking::panic
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\panicking.rs:145
   3: delta_kernel_ffi::ffi_tracing::tests::info_logs_with_log_line_tracing
             at .\src\ffi_tracing.rs:508
   4: delta_kernel_ffi::ffi_tracing::tests::info_logs_with_log_line_tracing::closure$0
             at .\src\ffi_tracing.rs:488
   5: core::ops::function::FnOnce::call_once<delta_kernel_ffi::ffi_tracing::tests::info_logs_with_log_line_tracing::closure_env$0,tuple$<> >
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688\library\core\src\ops\function.rs:250
   6: core::ops::function::FnOnce::call_once
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

---- ffi_tracing::tests::info_logs_with_formatted_log_line_tracing stdout ----

thread 'ffi_tracing::tests::info_logs_with_formatted_log_line_tracing' panicked at ffi\src\ffi_tracing.rs:533:38:
called `Result::unwrap()` on an `Err` value: PoisonError { .. }
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src\panicking.rs:692
   1: core::panicking::panic_fmt
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\panicking.rs:75
   2: core::result::unwrap_failed
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\result.rs:1704
   3: enum2$<core::result::Result<std::sync::poison::mutex::MutexGuard<tuple$<> >,std::sync::poison::PoisonError<std::sync::poison::mutex::MutexGuard<tuple$<> > > > >::unwrap
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688\library\core\src\result.rs:1109
   4: delta_kernel_ffi::ffi_tracing::tests::info_logs_with_formatted_log_line_tracing
             at .\src\ffi_tracing.rs:533
   5: delta_kernel_ffi::ffi_tracing::tests::info_logs_with_formatted_log_line_tracing::closure$0
             at .\src\ffi_tracing.rs:532
   6: core::ops::function::FnOnce::call_once<delta_kernel_ffi::ffi_tracing::tests::info_logs_with_formatted_log_line_tracing::closure_env$0,tuple$<> >
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688\library\core\src\ops\function.rs:250
   7: core::ops::function::FnOnce::call_once
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

---- ffi_tracing::tests::trace_event_tracking stdout ----

thread 'ffi_tracing::tests::trace_event_tracking' panicked at ffi\src\ffi_tracing.rs:594:38:
called `Result::unwrap()` on an `Err` value: PoisonError { .. }
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\std\src\panicking.rs:692
   1: core::panicking::panic_fmt
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\panicking.rs:75
   2: core::result::unwrap_failed
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\result.rs:1704
   3: enum2$<core::result::Result<std::sync::poison::mutex::MutexGuard<tuple$<> >,std::sync::poison::PoisonError<std::sync::poison::mutex::MutexGuard<tuple$<> > > > >::unwrap
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688\library\core\src\result.rs:1109
   4: delta_kernel_ffi::ffi_tracing::tests::trace_event_tracking
             at .\src\ffi_tracing.rs:594
   5: delta_kernel_ffi::ffi_tracing::tests::trace_event_tracking::closure$0
             at .\src\ffi_tracing.rs:593
   6: core::ops::function::FnOnce::call_once<delta_kernel_ffi::ffi_tracing::tests::trace_event_tracking::closure_env$0,tuple$<> >
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688\library\core\src\ops\function.rs:250
   7: core::ops::function::FnOnce::call_once
             at /rustc/4d91de4e48198da2e33413efdcd9cd2cc0c46688/library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.


failures:
    ffi_tracing::tests::info_logs_with_formatted_log_line_tracing
    ffi_tracing::tests::info_logs_with_log_line_tracing
    ffi_tracing::tests::trace_event_tracking

test result: FAILED. 10 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out; finished in 23.38s

error: test failed, to rerun pass `-p delta_kernel_ffi --lib`
Error: Process completed with exit code 1.

[zachschuermann]

failures:

    ffi_tracing::tests::info_logs_with_formatted_log_line_tracing
    ffi_tracing::tests::info_logs_with_log_line_tracing
    ffi_tracing::tests::trace_event_tracking

all due to the same error:

thread 'ffi_tracing::tests::trace_event_tracking' panicked at ffi\src\ffi_tracing.rs:594:38:
called `Result::unwrap()` on an `Err` value: PoisonError { .. }

[zachschuermann]

related: #584