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4c5e44a1cd
Adds a cluster feature called TEST_ONLY_FEATURE. It can only be marked as supported via error injection "features_enable_test_feature", which can be enabled on node startup via CLI option or YAML configuration. The purpose of this cluster feature is to simulate upgrading a node to a version that supports a new feature. This allows us to write tests which verify that the cluster feature mechanism works. The fact that TEST_ONLY_FEATURE can only be enabled via error injection should make it impossible to accidentally enable it in release mode and, consequently, in production.