This change removes the `GetLatestWorkspaceBuilds` query which includes
all workspaces for all time (including deleted). This allows us to also
stop using `GetProvisionerJobsByIDs` for said builds as the job status
is included in `GetWorkspaces` called separately.
**BREAKING CHANGE**: The `coderd_api_workspace_latest_build` Prometheus
metric no longer includes builds belonging to deleted workspaces, as
such, this metric will show fewer statuses.
Fixescoder/internal#717