fix(pika): pass destination instead of task_name to _enrich_span (#4563)

* Update span enrichment to use destination instead of task_name

* Refactor enrich_span assertion in test_utils.py

- tightened the test_get_span assertion to verify _enrich_span
is called with destination, not task_name.
- changed enrich_span.assert_called_once() to enrich_span.assert_called_once_with(...) with destination as the argument.

* Update CHANGELOG.md

* Update CHANGELOG with recent fixes and improvements

- Update CHANGELOG.md
- Updated the Pull Request URL

* Update CHANGELOG.md

* Add changelog fragment for pika destination fix

* Update .changelog/4563.fixed

Co-authored-by: Tammy Baylis <96076570+tammy-baylis-swi@users.noreply.github.com>

* Update 4563.fixed

---------

Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Co-authored-by: Tammy Baylis <96076570+tammy-baylis-swi@users.noreply.github.com>