feat(coderd/provisionerdserver): insert sub agent resource (#21699)

Update provisionerdserver to handle the changes introduced to
provisionerd in https://github.com/coder/coder/pull/21602

We now create a relationship between `workspace_agent_devcontainers` and
`workspace_agents` with the newly created `subagent_id`.

coderd/database/dbgen/dbgen.go

@@ -394,6 +394,7 @@ func WorkspaceAgentDevcontainer(t testing.TB, db database.Store, orig database.W
 		Name:             []string{takeFirst(orig.Name, testutil.GetRandomName(t))},
 		WorkspaceFolder:  []string{takeFirst(orig.WorkspaceFolder, "/workspace")},
 		ConfigPath:       []string{takeFirst(orig.ConfigPath, "")},
+		SubagentID:       []uuid.UUID{orig.SubagentID.UUID},
 	})
 	require.NoError(t, err, "insert workspace agent devcontainer")
 	return devcontainers[0]