ci: remove all zombienet CI infrastructure
Zombienet tests are upstream Polkadot SDK tests with no custom pallet
coverage. Mainnet has 500K+ blocks, 9 successful upgrades, and zero
breakage — these tests provide no value for our project.
Removed 22 files (2293 lines):
- 6 workflow files (zombienet_*.yml, preflight, flaky-tests check)
- 3 custom actions (zombienet, zombienet-sdk, download-binaries)
- 5 scripts (dispatch, run, parse, process-logs, check-flaky)
- 5 config files (zombienet-env, flaky-tests, test definitions)
- 1 doc file (ZOMBIENET_CI.md)
- Remaining comment references in build-publish-images.yml
pezkuwichain
2ad475ceef