Remove xfail tracebacks from testsuite

[phofl]

• Closes CI is printing tracebacks for all xfailed tests which can be very confusing #10986
• Tests added / passed
• Passes pre-commit run --all-files

see https://docs.pytest.org/en/latest/changelog.html#id34

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

     15 files  ±0       15 suites  ±0   3h 19m 14s ⏱️ + 1m 1s
 13 107 tests ±0   12 154 ✅ ±0     930 💤 ±0  23 ❌ ±0 
162 263 runs  ±0  142 082 ✅  - 2  20 158 💤 +2  23 ❌ ±0 

For more details on these failures, see this check.

Results for commit 5e02cfa. ± Comparison against base commit 0153204.

[jrbourbeau]

Thanks for tracking this one down @phofl