[#3] fix nightly pipeline

[elfenpiff]

Notes for Reviewer

Fixes the nightly pipeline by removing the pthread_cancel and pthread_exit features. The functionality can be easily implemented with an atomic bool that is changed when the thread shall terminate.

Pre-Review Checklist for the PR Author

1. Add sensible notes for the reviewer
2. PR title is short, expressive and meaningful
3. Relevant issues are linked in the References section
4. Every source code file has a copyright header with SPDX-License-Identifier: Apache-2.0 OR MIT
5. Branch follows the naming format (iox2-123-introduce-posix-ipc-example)
6. Commits messages are according to this guideline
   • Commit messages have the issue ID ([#123] Add posix ipc example)
   • Commit author matches Eclipse Contributor Agreement (and ECA is signed)
7. Tests follow the best practice for testing
8. Changelog updated in the unreleased section including API breaking changes
9. Assign PR to reviewer
10. All checks have passed (except task-list-completed)

Checklist for the PR Reviewer

• Commits are properly organized and messages are according to the guideline
• Unit tests have been written for new behavior
• Public API is documented
• PR title describes the changes

Post-review Checklist for the PR Author

1. All open points are addressed and tracked via issues

References

Relates to #3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.15%. Comparing base (336513d) to head (980189b).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #495      +/-   ##
==========================================
+ Coverage   79.14%   79.15%   +0.01%     
==========================================
  Files         200      200              
  Lines       23724    23728       +4     
==========================================
+ Hits        18776    18783       +7     
+ Misses       4948     4945       -3     

Files with missing lines	Coverage Δ
iceoryx2-bb/log/src/lib.rs	76.92% <100.00%> (+12.92%)	⬆️
iceoryx2-bb/posix/src/barrier.rs	77.65% <100.00%> (ø)
iceoryx2-bb/posix/src/thread.rs	56.06% <ø> (-0.59%)	⬇️
iceoryx2-pal/posix/src/linux/pthread.rs	85.94% <ø> (-0.28%)	⬇️

... and 3 files with indirect coverage changes