pw_env_setup: Update json formatting Update json formatting to what the roller will output so the next roll only changes relevant lines. See pwrev/46402 for what a test roll does to the formatting. This CL is that CL minus the host tools change. Bug: 385 Change-Id: I95982581add3d0527d02784b6668cb294dfd355a Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/46500 Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Reviewed-by: Ewout van Bekkum <ewout@google.com>
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