refactor(3p/gerrit-queue): use go:embed, bump go1.16, drop shell.nix r/3243

Previously, gerrit-queue used statik to embed files. Since go1.16, we
have go:embed, which solves this much nicer, without any requirements to
have the statik binary around.

As the only other thing the shell.nix and .envrc plumbing did was bring
a version of Go in scope, it's dropped now. We assume to have a
recent-enough go binary around, else go will complain.

Imported from https://github.com/flokli/gerrit-queue/pull/9

Change-Id: I851b06777a29d4f2d955cf3a7db6455a7189bc46
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4329
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Autosubmit: tazjin <mail@tazj.in>

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