[remote] Remove unused testing/web-platform/tests/tools/webdriver/webdriver/bidi.py

Differential Revision: https://phabricator.services.mozilla.com/D127266

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1733589
gecko-commit: c5ae8a0e9db8b621d1e23b711862e4faabc1c79c
gecko-reviewers: webdriver-reviewers, jgraham

Author: juliandescottes