[Telemetry] Remove unit-info.json from tools/perf
[Telemetry] Remove unit-info.json from tools/perf

Now that the canonical version of unit-info.json is in Telemetry, we need to
remove the copy from tools/perf.

BUG=459450
R=nednguyen

Review URL: https://codereview.chromium.org/1183683003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#334528}

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