fix: make build table show empty instead of loading when none are recent (#5666)

* Fix builds to show empty instead of loading

* Switch to backend fix

* Increase e2e test timeout

* Format

coderd/workspacebuilds_test.go

@@ -171,6 +171,8 @@ func TestWorkspaceBuilds(t *testing.T) {
 		)
 		require.NoError(t, err)
 		require.Len(t, builds, 0)
+		// Should never be nil for API consistency
+		require.NotNil(t, builds)
 
 		builds, err = client.WorkspaceBuilds(ctx,
 			codersdk.WorkspaceBuildsRequest{WorkspaceID: workspace.ID, Since: database.Now().Add(-time.Hour)},