fix(workflows): remove dupe, update workflows for bulding main, workflow_dispatch, repo_dispatch 🥟

[alismx]

Changes Proposed

• This PR modifies the packMachines.yml workflow file.
• The PR also removed dibbsVm.yml file, we can just put the repo dispatch where we need it
• Update how we install the qemu package
  • This is probably worth revisiting as we expand to support other sources (I wasn't able to get the docker-setup-qemu action to work in this context, if anybody knows how to fix this issue LMK!)

Additional Information

• When we build:
  • pushes to main
  • changes in the packer or .github dirs
  • repo dispatch
  • workflow dispatch

Testing

• workflow dispatch is testable by doing the following:
  • go here: https://github.com/CDCgov/dibbs-vm/actions/workflows/packMachines.yml
  • select Run workflow
  • change to alis/workflow_fix_1 branch
  • select either service
  • a valid tag, main should work
• Merging this will test the push to main
• Once this is on main, we can test the repo dispatch by trigger this workflow.