refactor!: remove unused provisioning scripts (#31811)

These scripts were written to replace some of the
Ansible provisioning steps in Devstack,
before tCRIL's focus turned to Tutor.

These scripts never ended up being used by Devstack, but
Devstack's maintainers did end up replacing
the Ansible provisioning steps with some direct
Bash commands in Devstack's provision-lms.sh:
https://github.com/openedx/devstack/blob/23e16c1ddad3c18cbb539fecc5237d28b387bdc4/provision-lms.sh#L51-L68

Tutor has its own user & course provisioning scripts,
written in Sh using Tutor's jobs framework.

Thus, these scripts are no longer needed and do
not seem to be in use.