chore: add scaletest convenience script (#7819)

- 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.

site/.eslintignore

@@ -61,8 +61,8 @@ stats/
 # Loadtesting
 .././scaletest/terraform/.terraform
 .././scaletest/terraform/.terraform.lock.hcl
-terraform.tfstate.*
-**/*.tfvars
+../scaletest/terraform/secrets.tfvars
+.terraform.tfstate.*
 # .prettierignore.include:
 # Helm templates contain variables that are invalid YAML and can't be formatted
 # by Prettier.

site/.prettierignore

@@ -61,8 +61,8 @@ stats/
 # Loadtesting
 .././scaletest/terraform/.terraform
 .././scaletest/terraform/.terraform.lock.hcl
-terraform.tfstate.*
-**/*.tfvars
+../scaletest/terraform/secrets.tfvars
+.terraform.tfstate.*
 # .prettierignore.include:
 # Helm templates contain variables that are invalid YAML and can't be formatted
 # by Prettier.