Add browser tests, excluded from acceptance-tests errand by default.

[#79309104]
Comment out upgrade acceptance test

Most of our environments do not yet have a Runtime that supports the upgrade endpoint. Until they do, we need to keep this test commented out. As soon as the envs are ready, we can uncomment this and allow them to run
Update route-registrar so it writes its own pid

no more pgrep
Haproxy can be scaled and dashboard urls match haproxy indexes

default is 2 HAProxies
[#78082222]