sweet: reenable gVisor benchmark

The issue preventing the gVisor benchmark from working has magically
been resolved by us doing nothing. Yay! Reenable the benchmark.

... Except the startup benchmark, which does `runsc run`, doesn't work
on the builders. Womp womp. Disable just that benchmark for now; any
coverage here is useful.

Fixes #51445.
Updates #67508.

Change-Id: Ic0bd03038ef392640bf39c801cff2395678a8216
Cq-Include-Trybots: luci.golang.try:x_benchmarks-gotip-linux-amd64-longtest
Reviewed-on: https://go-review.googlesource.com/c/benchmarks/+/586097
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
4 files changed