* Partially disable test files.
* Use DockerServers in EPM tests.
* Only run tests when DockerServers have been set up
* Reenable ingest manager API integration tests
* Pass new test_packages to registry container
* Enable DockerServers tests in CI.
* Correctly serve filetest package for file tests.
* Add helper to skip test and log warning.
* Reenable further file tests.
* Add developer documentation about Docker in Kibana CI.
* Document use of yarn test:ftr
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
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