fix(agent): More protection for lost output of SSH PTY commands #6833
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This fixes an immediate problem of PTY output potentially being lost when using
ssh -t
.It also fixes test flakes: https://github.com/coder/coder/actions/runs/4533441494/jobs/7986257296
Finally, adds a test to prove we still have a problem (disabled for now).
Fixes #6656 (part 2)