chore(ci): add command to fmt testdata terraform files

[h3adex]

Description

A small PR to also format testfiles in the service directories

Checklist

• Issue was linked above
• Code format was applied: make fmt
• Examples were added / adjusted (see examples/ directory)
• Docs are up-to-date: make generate-docs (will be checked by CI)
• Unit tests got implemented or updated
• Acceptance tests got implemented or updated (see e.g. here)
• Unit tests are passing: make test (will be checked by CI)
• No linter issues: make lint (will be checked by CI)

[github-actions]

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[marceljk]

Thanks for your contribution!
Looks good to me and makes it a lot easier to keep every test config nicely formatted :)