x/benchmarks/sweet: re-enable gVisor benchmarks

[prattmic]

The gVisor benchmarks were disabled in https://go.dev/cl/653755 due to breakage from https://go.dev/cl/652276. See #68437 (comment).

We should re-enable once it is fixed upstream.

[gopherbot]

Change https://go.dev/cl/653755 mentions this issue: sweet: disable gVisor by default

[gabyhelp]

Related Issues

• x/benchmarks/sweet: disable gvisor for arm64 by default #67869 (closed)

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