orchestratord point balancers at environmentd internal port

[alex-hunt-materialize]

Has orchestratord point balancers at the environmentd internal port.
Removes references to the deprecated environmentd balancer port.

Motivation

• This PR fixes a previously unreported bug.
  Self-hosted installs could not connect through the balancer, as we haven't implemented auth yet.

• This PR refactors existing code.
  Removes references to the deprecated environmentd balancer port.

Tips for reviewer

Checklist

• This PR has adequate test coverage / QA involvement has been duly considered. (trigger-ci for additional test/nightly runs)
• This PR has an associated up-to-date design doc, is a design doc (template), or is sufficiently small to not require a design.
• If this PR evolves an existing $T ⇔ Proto$T mapping (possibly in a backwards-incompatible way), then it is tagged with a T-proto label.
• If this PR will require changes to cloud orchestration or tests, there is a companion cloud PR to account for those changes that is tagged with the release-blocker label (example).
• If this PR includes major user-facing behavior changes, I have pinged the relevant PM to schedule a changelog post.

[doy-materialize]

if we do this, can we point the console at the balancer? i think that would simplify things

[alex-hunt-materialize]

if we do this, can we point the console at the balancer? i think that would simplify things

Probably. I'll try that now.