chore(operations): Make environment use ubuntu 20.04 (#2971)

* Make environment ubuntu 20.04

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Migrate flows

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Try bootstrap

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Finnick some sudos

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Fixup prereqs for add-apt-repo

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Add rust-toolchain

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Use 18.04 in k8s for now

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Update bencher script

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Seems there is a bug in GA

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Add remarshal

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Fixup a typo

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Fix fmt

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Add aws env vars to ci

Signed-off-by: Ana Hobden <operator@hoverbear.org>

* Only run benches on bench-* branches

Signed-off-by: Ana Hobden <operator@hoverbear.org>