* upgrade to wartremover 2.4.9
* simplify wart list and list JavaConversions as disabled
* no changelog
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* delete long-obsolete, contradictory comment
* also upgrade wartremover in compatibility (leaving aside maven_install.json)
* update compatibility maven_install.json to match
We take our own libraries from latest_stable_version which changed but
we did not rerun pinning which meant that this did not get updated.
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This is preparatory work for hitting the transaction service (and
others but that one is the most important) which isn’t possible via
DAML Script. To ease review, this PR only switches from a DAML Script
to a custom Scala binary. It does not yet change what is tested.
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