Shared namespace support

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This MR adds initial support for "shared namespaces" in GitLab Workspaces. This allows an Agent administrator to deploy all Workspaces to a single namespace, without cluster-level permissions. It also includes a few formatting changes from running make fmt-bazel

References

• Agent: Update workspace creation and terminatio... (gitlab-org/gitlab#519260 - closed)
• Agent: Call Rails API to fetch prerequisite inf... (gitlab-org/gitlab#519262 - closed)
• Allow remote development to create workspaces f... (gitlab-org&12327 - closed)

Review Checklist

• Be sure to consider the scalability and availability impact of this changes by evaluating the impact of them at scale.