Unalbe to upload failure stacktraces from the phpunit framework

**Describe the bug**
Unalbe to upload failure stacktraces from the phpunit framework

We have PHPUnit integration setup according to the instructions, however stack traces are missing from the report. According to [the code](https://github.com/allure-framework/allure-phpunit/blob/main/src/Event/TestFailedSubscriber.php#L31) of the allure library, it only includes a message, without a stack trace.

**To Reproduce**
fail a test

**Expected behavior**
A clear and concise description of what you expected to happen.

when a test failed, then the stacktrace is included into the test result.

**Screenshots**

NA

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NA

**Additional context**
Add any other context about the problem here.

Inspect src/Event/TestFailedSubscriber.php around line 31 and the PHPUnit failure event data used there. Run a deliberately failing PHPUnit test and compare the generated report with the failure details; done means the test result includes the failure stack trace, not only its message.

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