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Revert of [Telemetry] Pass test_runner environment in local args instead of a global variable (patchset #9 id:160001 of https://codereview.chromium.org/942663002/)

Reason for revert:
crbug.com/462063

Original issue's description:
> [Telemetry] Pass test_runner environment in local args instead of a global variable
>
> Also adds more fields to environment to narrow the scope of
> benchmark and user story set discovery. This should avoid problems
> with adding Python files to unrelated directories, and hides PageTests
> from external Telemetry benchmark runners like run_gpu_tests.py and
> chrome_proxy's run_benchmark.
>
> R=dtu,nednguyen,sullivan,kbr@chromium.org,bolian
> BUG=460181
> TEST=tools/perf/run_benchmark; content/test/gpu/run_gpu_tests.py; tools/chrome_proxy/run_benchmark  # All return a full and correct test list.
>
> Committed: https://crrev.com/1da5f7f70ea6dc7dd0667ea78637802c76305f5a
> Cr-Commit-Position: refs/heads/master@{#318149}

TBR=bolian@chromium.org,dtu@chromium.org,kbr@chromium.org,nednguyen@google.com,sullivan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=460181

Review URL: https://codereview.chromium.org/955183003

Cr-Commit-Position: refs/heads/master@{#318175}