TFE Release v202106-1 (544)

Added support for several new capabilities in remote runs triggered via the CLI and API: -refresh=false, -refresh-only, and -replace=ADDRESS. See the documentation for more details on each of these options.
Added Terraform CLI versions up through 0.15.5 to Terraform Enterprise.
Changed Terraform Cost Estimation to use the new, free Azure pricing API. This changes the Azure egress hostname to prices.azure.com.
Updated the UX for the Registry
Changed the Sentinel runtime to version 0.18.3. For the latest changes, see the release notes.

Upgrade Golang 1.14.0 => 1.16.4
Fixed unexpected exceptions when accessing a JSON plan that was created before April 2019.
Fix issue where runs might get stuck in cost estimating
Fixed an authorisation check for service accounts and SSO, which prevented service account created runs from being auto applied.
Fixed an issue that prevented commenting on runs by certain users who otherwise should be permissed.
Fixed support for Azure appservice v2/V2 tiers with spaces
Fixed an issue where Sentinel VCS status checks were not receiving a response from speculative plans.
Fixed a potential conflict condition when starting multiple TFE instances simultaneously.

The Vault unseal key and root token are no longer persisted to disk in the Vault container.
The PostgreSQL 9.5 to 12 upgrade container has been removed.
The PostgreSQL default password migration container has been removed.

Updated Registry Module APIs.
- added registry_name scoped APIs.
- added organization_name scoped APIs.
- added Module List API.
- updated Module Delete APIs.
Runs: added refresh, refresh-only, and replace-addrs attributes.