[gpctl] add users unblock command

[kylos101]

Description

To help automate unblocking users

Related Issue(s)

Fixes n/a

How to test

Got a preview environment created with leeway run dev:preview.

Made myself an admin via leeway run components:make-user-admin

Got an access token, and ran the below tests from a workspace in the preview environment from this branch:

# stops the workspaces and blocks the user
go run . users block --token $TOKEN --address wss://kylos101-u73aa6162e2.preview.gitpod-dev.com/api/v1 f66c4875-42d9-4a51-955e-b80b788cdfcc
# cannot really test w/o another person
go run . users unblock --token $TOKEN --address wss://kylos101-u73aa6162e2.preview.gitpod-dev.com/api/v1 f66c4875-42d9-4a51-955e-b80b788cdfcc

Documentation

Preview status

gitpod:summary

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 / Integration Tests

• /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
• /werft preemptible
  Saves cost. Untick this only if you're really sure you need a non-preemtible machine.
• with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh. If enabled, with-preview and with-large-vm will be enabled.
• with-monitoring

/hold