Remove the unused output options from runTxBuild

[smelc]

Changelog

- description: |
    Remove the unused output options from runTxBuild
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  - refactoring    # QoL changes
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

• Follow-up of Add --current-treasury-value and --treasury-donation to transaction build and friends #778 (comment)
• Note that the CLI flag corresponding to the parameter being removed cannot be removed: this option's value is used elsewhere in the same command.

How to trust this PR

It doesn't change the runtime behavior

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• Self-reviewed the diff