Clean up broken WAL files in etcd

Issue

• There exist broken WAL files (*.wal.broken) in an etcd directory:

  $ ls -lh /var/lib/etcd/member/wal/
  [..]
  -rw-r--r--. 1 root root 62M Jun  7 10:23 000000000000e3c8-000000002ab095c9.wal.broken
  

• The Compliance Operator is reporting broken WAL files in the etcd directory.