Show blocked status label in deployments view

What does this MR do and why?

blocked is a new deployment status that was added as part of the Deployment Approvals feature. See https://docs.gitlab.com/ee/ci/environments/deployment_approvals.html and #343864 (closed).

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MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.