Updated docs and test apps

[ijlee2]

Description

The demo app for ember-container-query shares code with embroider-css-modules and ember-workshop. I recently updated the latter two, so it's time to update this repo's app.

Notes

I couldn't convert <Widgets::Widget-3> to a <template>-tag component. It would need to import <Widgets::Widget-3::TourSchedule> in the .gts file, but there seems to be a bug in Embroider:

/* This didn't work */
import WidgetsWidget3TourSchedule from './widget-3/tour-schedule';

[docs-app] Build Error (PackagerRunner) in components/widgets/widget3/tour-schedule.ts
[docs-app] 
[docs-app] Module build failed (from ../../../../node_modules/.pnpm/thread-loader@3.0.4_webpack@5.89.0/node_modules/thread-loader/dist/cjs.js):
[docs-app] Thread Loader (Worker 0)
[docs-app] ENOENT: no such file or directory, open '/docs-app/node_modules/.embroider/rewritten-app/components/widgets/widget3/tour-schedule.ts/tour-schedule.ts'
[docs-app]     at PoolWorker.fromErrorObj (/node_modules/.pnpm/thread-loader@3.0.4_webpack@5.89.0/node_modules/thread-loader/dist/WorkerPool.js:346:12)
[docs-app]     at /node_modules/.pnpm/thread-loader@3.0.4_webpack@5.89.0/node_modules/thread-loader/dist/WorkerPool.js:219:29
[docs-app]     at mapSeries (/node_modules/.pnpm/neo-async@2.6.2/node_modules/neo-async/async.js:3625:14)
[docs-app]     at PoolWorker.onWorkerMessage (/node_modules/.pnpm/thread-loader@3.0.4_webpack@5.89.0/node_modules/thread-loader/dist/WorkerPool.js:173:34)
[docs-app]     at /node_modules/.pnpm/thread-loader@3.0.4_webpack@5.89.0/node_modules/thread-loader/dist/WorkerPool.js:146:14
[docs-app]     at Socket.onChunk (/node_modules/.pnpm/thread-loader@3.0.4_webpack@5.89.0/node_modules/thread-loader/dist/readBuffer.js:40:9)
[docs-app]     at Socket.emit (node:events:514:28)
[docs-app]     at Readable.read (node:internal/streams/readable:539:10)
[docs-app]     at Socket.read (node:net:750:39)
[docs-app]     at flow (node:internal/streams/readable:1023:34)
[docs-app]     at emitReadable_ (node:internal/streams/readable:604:3)
[docs-app]     at process.processTicksAndRejections (node:internal/process/task_queues:81:21)

Maybe the combination of hyphen, followed by an ending number, causes an issue? (Renaming the folder widget-3 to widget3 seemed to fix the build error.)

[ijlee2]

Not only is this function easier to type (before, CustomAssert had tried to append things to the assert type that qunit-dom already builds on top of qunit), the tests seem to now finish sooner (~35 seconds before, ~23 seconds now).