Since 3c7af28725, the cqlsh submodule no longer contains a bin/cqlsh shell script. This broke the supermodule's bin/cqlsh shortcut. Fix it by invoking cqlsh.py directly. Closes scylladb/scylladb#20591
3c7af28725
Add bin/cqlsh as a shortcut to tools/cqlsh/bin/cqlsh, intended for developers. Closes #14362