[obs] add node variable and update panels in Node PSI dashboard to use it

[kylos101]

Description

Make it easier to observe PSI for one or more nodes

Related Issue(s)

Related to WKS-303

How to test

Run CPU burn on many workspaces from a preview environment.

Documentation

Preview status

Gitpod was successfully deployed to your preview environment.

• 🏷️ Name - kylos101-2t04q5vxdek
• 🔗 URL - kylos101-2t04q5vxdek.preview.gitpod-dev.com/workspaces.
• 📚 Documentation - See our internal documentation for information on how to interact with your preview environment.
• 📦 Version - kylos101-2t04q5VxDek-gha.13309

Build Options

Build

• /werft with-werft
  Run the build with werft instead of GHA
• leeway-no-cache
• /werft no-test
  Run Leeway with --dont-test

Publish

• /werft publish-to-npm
• /werft publish-to-jb-marketplace

Installer

• analytics=segment
• with-dedicated-emulation
• workspace-feature-flags
  Add desired feature flags to the end of the line above, space separated

Preview Environment

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-gce-vm
  If enabled this will create the environment on GCE infra
• with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh

/hold