* feat: allow scaling down scaletest environments
* fix bugged namespace deletion
* misc fixes to scaletest.sh
* destroy namespaces is a no-op as the cluster will be gone anyway
- Adds a convenience script `scaletest.sh` to automate process of running scale tests
- Enables pprof endpoint by default, and captures pprof traces before tearing down infra.
- Improves idempotency of coder_init.sh
- Removes the promtest.Float64 invocations in workspacetraffic runner, these metrics will be in prometheus.
- Increases default workspace traffic output to 40KB/s/workspace.
- Exposes reads/writes from scaletest traffic generation (default: 0.0.0.0:21112)
- Adds self-hosted prometheus with remote_write to loadtest terraform
- Adds convenience script to run a traffic generation test