[WIP] Add a script: bin/cleanup_all.sh

[ttarczynski]

Link related issues:

• Resolves # (if merging this resolves the issue)
• Progress towards # (if it's incremental progress)

Changes/added features:

• Add a script to cleanup all state files and .terraform dirs

The following short checklist should be used to make sure your PR is of good quality, and can be merged easily:

• follows project conventions
• follows project principles
• ./run.sh works correctly for all new examples
• CI checks pass
• mergeable to main (no conflicts)
• resolved issues linked
• Milestone linked (if applicable)

Reviewers:
@ianmiell
@ttarczynski
@sanyer
@teszes
@choilmto
@rodrigorras