AbstractChangelogConditionalScriptAllowlist.groovy is a superclass of the Groovy scripts for some subclasses of
DeclarativeStageConditional, but does not have any direct equivalent Java class, so we just allow it here.
An internal step used to take a tool descriptor ID and tool version and get the environment variables that
tool installation would normally contribute, in a List<String> of "VAR=VALUE"s suitable
for passing to withEnv.
Used to mark why a stage was skipped for internal purposes, allowing us to abstract away handling of skipped stages
without needing chains of if/else or cases to get the different behaviors.