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This reverts commit f26b6b6d.

Reason for revert: Causes presubmit failure due to generate_buildbot_json attempting to read deleted luci-milo-dev.cfg.

Original change's description:
> Migrate luci-milo-dev.cfg to starlark.
> 
> Bug: 1011908
> Change-Id: Ic7f4fc26d75811f04c9f988866bb479a40e0d0c3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869713
> Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
> Reviewed-by: Aaron Gable <agable@chromium.org>
> Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#708714}

TBR=agable@chromium.org,gbeaty@chromium.org

Change-Id: I16fd97a3ccef990cd0d2bc58314f6006a3328f82
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1011908
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875660Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708821}