* scaletest: stop kubernetes_secret from being constantly recreated
* scaletest: ensure we do not get auto-upgraded
* scaletest: add external provisionerd deployment, the lazy way
* 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
Updates scaletest terraform with learnings from #8213:
- Increase max pods per node to 256
- Decrease CPU requests for test workspace to allow maxing out workspaces per node
- Explicitly set CODER_ACCESS_URL for ssh to work
- Explicitly disable rate limits in coderd
- Increase DB size for medium and large scenarios
- Mount cache volume directly under /tmp/coder instead of /tmp.
- Plumb through requests and limits for workspaces
- Plumb through requests for coderd
- 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
