[DOC][MNT] developer guide for local testing, dockerized tests, &lmmentel #4285
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This PR adds a developer guide for local testing, which currently was in a bit of a confusing state for developers (mixing up CI on remote and testing on local).
It also salvages the docker images (as an alternative means of local or VM testing) from this PR abandoned by lmmentel:
#2249
reconciles it with the current state of the CI, and updates the dockers to the newest python versions.
(unfortunately, I was unable to work on the branch, as lmmentel has deleted it)
This PR also adds clear documentation for the dockerized tests, above the salvaged PR - in particular, not making them the primary recommended means of local testing since it's less beginner friendly.