test: use -logtostderr=NONE when running benchmarks

[asubiotto]

Log output is usually just noise when running benchmarks and messes with results (golang/go#25241). The approach has been to use log.Scope to redirect log output to a directory. My understanding (cc @benesch) is that we can use -logtostderr=NONE as an additional flag in make bench{short} to disable all log output to stderr for benchmarks that do not call log.Scope, with the option of preserving logs with the addition of a log.Scope to the benchmark. This would silence all benchmarks that do not call log.Scope.

The main blocker is that some packages do not recognize the -logtostderr flag. These packages need their main_test.go files enhanced with a log import similarly to pkg/util/caller/main_test.go

[github-actions]

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[knz]

we've fixed this