Expose the current step's status to SEL for conditional branching

[akashdw]

Pull Request type

• Bugfix
• Feature
• Refactoring (no functional changes, no api changes)
• Build related changes (Please run ./gradlew build --write-locks to refresh dependencies)
• Other (please describe):

NOTE: Please remember to run ./gradlew spotlessApply to fix any format violations.

Changes in this PR

A step transition condition is evaluated in the context of the step it is attached to, so it can already read that step's own params, but it had no way to read that step's status. The status was only reachable for a different step, through the two-arg params.getFromStep('<step>', 'MAESTRO_STEP_STATUS'), which needs the referenced step to be already finished and therefore cannot be the step the condition hangs off.

This adds the status to the single-arg current-step accessor, so a transition condition can branch on how its own step ended:

params.getFromStep('MAESTRO_STEP_STATUS') == 'COMPLETED_WITH_ERROR'

StepInstanceAttributes carries the status from the step's runtime state, and fromStep(String) returns it under the existing MAESTRO_STEP_STATUS key, alongside MAESTRO_STEP_ERROR_RETRIES which is already exposed there. The SEL language guide documents the single-arg overload, which was previously undocumented.

[rdeepak2002]

Lgtm! TIL that evaluateNextConditionParams is called only after the step is already in a terminal state

[praneethy91]

LGTM thanks