chore: stop using AgentAPI for sending logs

[johnstcn]

Problem

Envbuilder currently uses codersdk.AgentLogSender to send logs back to Coder.
This unfortunately requires us to check the Coder version to see if it supports AgentAPI v2 or v1, and engage the correct log sender in each case. It also requires us to import coder/coder as a dependency.
It would be nice if we could avoid this

Proposed solution

Unknown yet. Is there another way to send logs to Coder?