- Adds `--use-host-login` to `coder exp scaletest workspace-traffic`
- Modifies getScaletestWorkspaces to conditionally filter workspaces if `CODER_DISABLE_OWNER_WORKSPACE_ACCESS` is set
- Adds a warning if `CODER_DISABLE_OWNER_WORKSPACE_ACCESS` is set and scaletest workspaces are filtered out due to ownership mismatch.
- Modifies `coderdtest.New` to detect cross-test bleed of `CODER_DISABLE_OWNER_WORKSPACE_ACCESS` and fast-fail.