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Add debugging to diagnose:
flutter#154151

This reverts commit 54c886b.

Reverts #154441


https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20packages_autoroller/11826/overview

I can't see how this change would be causing the specific failure on the
tree, but the failure is consistent after this commit, so speculatively
reverting.

The revert label isn't working since we're out of the window, so this is
a manual revert.

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Reverts #154555
Re-lands of #154441 and #154369

New changes in this PR:

1. extend timeout of the `Linux packages_autoroller` shard (see step 14 in this example [LED build](https://ci.chromium.org/ui/p/flutter/builders/prod.shadow/Linux%20packages_autoroller/7/infra))
2. use the managed framework repo as the working directory in the `framework.streamDart()` helper function--we were generating gradle lockfiles in the wrong directory

A LED build with this code generated the following gradle lockfile update: d939981

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