Draft: dev: add test script for harbor

• Useful when upgrading harbor
• setup creates dummy data for testing (use before an upgrade)
• validate checks that harbor contains the expected dummy data created by setup (use after an upgrade to confirm the data still exists)
• cleanup restores harbor to its original state
• All steps are expected to be idempotent
• Corresponds to the first 3 steps here: https://goharbor.io/docs/2.9.0/administration/upgrade/upgrade-test/
• Steps 13, 14, 15 could probably be added too