Re-export substituteExecutionUnits

[locallycompact]

Changelog

- description: |
    Re-export substituteExecutionUnits
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  # - breaking       # the API has changed in a breaking way
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[locallycompact]

I added this to replace a use of mapTxScriptWitnesses.

https://github.com/IntersectMBO/cardano-node-emulator/pull/34/files#diff-a2bac2443a4df3d61a48e3cf23adfd1a2083b417cf5db289999ddcaea5c14c90R93