required - Build fails if the artifact can not be published
Similar to shared, default is false and must be explicitly requested.
addArtifact - new parameter
getArtifactDefinition - show required field
getArtifactDefinition - new Required column added to the end of the header and data fields
This was added to output format 1, so a slight incompatibility for scripts processing CSV output
exportJob and exportPlan will include required field for artifacts as necessary
Bamboo supports this option on 6.6.x and above