Stack Output Exclude

stack output now respects the exclude block

terragrunt stack output previously ignored the exclude block on units, attempting to fetch outputs (including directly from S3 state when using --dependency-fetch-output-from-state) for units that should have been excluded.

The fix uses Terragrunt discovery to identify excluded units before reading outputs. Excluded units are now omitted from the stack output entirely, consistent with how they are handled during stack run.

To exclude a unit from stack output, add "output" to the actions list in the exclude block:

exclude {
  if      = true
  actions = ["plan", "apply", "destroy", "output"]
}

Special action values "all" and "all_except_output" are also supported.