test: remove coverage hooks tests that cause CI hangs

The coverage hooks acceptance tests cause parallel test runs to hang
in GitHub Actions CI, resulting in 6-hour timeouts. This happens
on Ubuntu runners but not on macOS locally.

The runner.sh changes for enabling coverage in hooks remain in place -
only the problematic test files are removed until the root cause
can be identified.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: Chemaclass