roachtest: datadog logging

[williamchoe3]

Closing this one out bc switched branches to preserve the backfill tool that exists in this branch, but don't want to merge the backfill tool to master, see new branch / pr here #158528

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This commit contains the backfill cli

[cockroach-teamcity]

This change is 

[blathers-crl]

Your pull request contains more than 1000 changes. It is strongly encouraged to split big PRs into smaller chunks.

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