cli: add roachtest that exercises debug.zip

Use the roachtest framework to add a `debug zip` test. The test should run a workload on a 3 node cluster, and retrieve a debug.zip successfully. Additionally, use the mixed version framework to support grabbing a debug.zip on a mixed version cluster. This will ensure that we don't break debug zip functionality in those critical situations when an upgrade is experiencing problems.

Also consider adding "debug zip" as an action to the DRT cluster so we can include it in the DRT cluster tests.

Jira issue: CRDB-37768