Clean up terraform code for old build/test jenkins boxes

Description

We still have the old build and test jenkins from when we last created a jenkins from scratch (~8 months ago). We should remove this from the terraform repo to avoid clutter and rename the jenkins boxes as appropriate.

The last section of this doc should help https://openedx.atlassian.net/wiki/spaces/TE/pages/182814103/Jenkins+Upgrade+Process

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Reporter

Mike Youngstrom

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