Post-dry-run enhancements for Linux workshop

Bugfixes, enhancements, and additions based on feedback from the dry-run group.

Tests were performed both automatically & manually, both locally (Vagrant) and remotely (AWS EC2).

Changes are:

Add Debian Packaging scoring step, instruction file, and unit test
Add Make targets to deploy & provision AWS resources (make up-aws and make provision-aws, respectively)
Move the score server code & deployment to the DB server
Bump Vagrant box & AWS AMI to Debian 12, so that we get Go 1.19 out of it (this allows for much more easily running the score server on the DB server)
Add wall commands to post messages to users' terminals on step completions
Add "Last Step Completed" to the score dashboard
Shuffled around the column order of the score dashboard
Make logs better for Admin service
General code cleanup in a few places

...uh, I added a lot more after we reviewed this, so.

opensourcecorp / workshop-linux