fix(coderd/database): improve task status in tasks_with_status view (#20683)

This change restructures the `tasks_with_status` view query to:

- Improve debuggability by adding a `status_debug` column to better
understand the outcome
- Reduce clutter from `bool_or`, `bool_and` which are aggregate
functions that did not actually have serve a purpose (each join is 0-1
rows)
- Improve agent lifecycle state coverage, `start_timeout` and
`start_error` were omitted
- These states are easy to trigger even in a perfectly functioning
workspace/task so we now rely on app health to report whether or not
there was an issue
- Mark canceling and canceled workspace build jobs as error state
- Agent stop states were implicitly `unknown`, now there are explicit (I
initially considered `error`, could go either way)

coderd/database/sqlc.yaml

@@ -106,6 +106,15 @@ sql:
           # Workaround for sqlc not interpreting the left join correctly.
           - column: "tasks_with_status.workspace_build_number"
             go_type: "database/sql.NullInt32"
+          - column: "tasks_with_status.status"
+            go_type:
+              type: "TaskStatus"
+          - column: "tasks_with_status.workspace_agent_lifecycle_state"
+            go_type:
+              type: "NullWorkspaceAgentLifecycleState"
+          - column: "tasks_with_status.workspace_app_health"
+            go_type:
+              type: "NullWorkspaceAppHealth"
         rename:
           group_member: GroupMemberTable
           group_members_expanded: GroupMember