Robust mutexes are not properly released from crashed threads on QNX 7.1

## Required information

**Operating system:** QNX 7.1

```sh
# uname -a
QNX x86_64-qnx-vm 7.1.0 2023/07/14-18:28:33EDT x86pc x86_64
```

**Rust version:**

```sh
$ rustc --version
rustc 1.88.0 (6b00bc388 2025-06-23
```

**Cargo version:**

```
$ cargo --version
cargo 1.88.0 (873a06493 2025-05-10)
```

**iceoryx2 version:**

`main` branch

**Detailed log output:**

No log output.

**Observed result or behaviour:**

Test `fn mutex_can_be_recovered_when_thread_died()` in `mutex_tests.rs` hangs then crashes without output.

**Expected result or behaviour:**

Since QNX supports [`pthread_mutexattr_setrobust()`](https://www.qnx.com/developers/docs/7.1/index.html#com.qnx.doc.neutrino.lib_ref/topic/p/pthread_mutexattr_setrobust.html), the test should pass.

**Conditions where it occurred / Performed steps:**

Run the `mutex_tests` binary on QNX 7.1.

Start by running the mutex_tests binary on QNX 7.1 and focus on mutex_tests.rs, especially mutex_can_be_recovered_when_thread_died(). Then inspect the mutex implementation used by that test and compare its behavior with QNX's pthread_mutexattr_setrobust support. Done means the test completes successfully on QNX 7.1 instead of hanging and crashing.

Written by the indexing model from the issue text.