feat(vats): support ORACLE_ADDRESSES from environment

[dckc]

refs: #9044
refs: #8400
refs: #8740

Description

#9044 supports getting GOV{1,2,3} addresses from the environment, but not the entire ORACLE_ADDRESSES list.
devnet / emerynet / mainnet usage requires specifying a list of more than 3 oracle operator addresses.

Security Considerations

The environment in which the proposal builder is run has to be carefully controlled.

Scaling Considerations

n/a

Documentation Considerations

A comment in priceFeedSupport.js didn't seem right. Rather than delete it, I added another one. This should be cleaned up in due course.

Also, we should

• confirm that operational stuff around this code is sufficiently documented

Testing Considerations

I presume manual integration testing suffices.

Upgrade Considerations

No additional upgrade considerations.

[mhofman]

This is not the way. We can't expect all validators to set the same env

[dckc]

This is not the way.

I see.