TFE Release v202108-1 (557)

Added run metadata to Docker containers performing Terraform operations
Added Terraform CLI versions up through 1.0.3 to Terraform Enterprise.
Added locked_by as an includable resource in the workspaces API.
Added ability for organization tokens to manage workspace notification configurations.
Updated run status badges and filtering options
Added the Workspace Overview to Terraform Cloud capability for Enterprise environments, including the newly released resource grid.
Added the ability to group and filter workspaces using singleton tags.

Fixed broken GitLab.com OAuth Application registration link.
Fixed handling Oauth Token refresh on failed workspace updates.
Fixed incorrect display of apply logs for canceled runs.
Fixed bug where JSON plan output was only kept for a week after run completion.
Fixed broken API token copy buttons in some browsers.
Fixed workspace relationship ID in state version API
Fixed organization settings navigation by hiding sections and switching to sentence case

Removed the ability for new users to change two-factor authentication settings without first confirming their email.
Ongoing container updates to address reported vulnerabilities in underlying packages / dependencies.

Introduced Workspace Tagging
- Updated Workspaces:
  - added tag_names attribute.
  - added POST /workspaces/:workspace_id/relationships/tags
  - added DELETE /workspaces/workspace-2/relationships/tags
- Added Organization Tags.
- Added tags attribute to tfrun
Notification configurations: Gave organization tokens permission to create and manage notification configurations.
State versions: Fixed the ID format for the workspace relationship of a state version. Previously, the reported ID was unusable due to a bug.
Workspaces: Added locked_by as an includable related resource.