Upgrade @ember/test-helpers to ^5.5.0

[NullVoxPopuli-ai-agent]

Upgrades @ember/test-helpers to ^5.5.0 in apps/repl, apps/tutorial, and packages/ember-repl.

This unblocks #2278.
ember-source main no longer registers view:-outlet (emberjs/ember.js#21460).
test-helpers 5.4 looks it up in setupRenderingContext, so every rendering test fails with:

TypeError: Cannot read properties of undefined (reading 'create')

5.5.0 (emberjs/ember-test-helpers#1573) renders with renderRootComponent when it exists, and still uses view:-outlet on older Ember.

Checked locally with pnpm turbo test:chrome, 0 failures in ember-repl, tutorial, and limber:

• with the current ember-source 7.4.0-alpha.1
• with the [BUGFIX lts] Include renderComponent roots in captureRenderTree emberjs/ember.js#21622 tarball from Test out: https://github.com/emberjs/ember.js/pull/21622 #2278

🤖 Generated with Claude Code

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​ember/​test-helpers@​5.4.1 ⏵ 5.5.0	+1		+1	+1

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[github-actions]

Project	Preview URL1	Manage
Limber	https://nvp-test-helpers-5-5.limber-glimdown.pages.dev	on Cloudflare
Tutorial	https://nvp-test-helpers-5-5.limber-glimmer-tutorial.pages.dev	on Cloudflare

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1. if these branch preview links are not working, please check the logs for the commit-based preview link. There is a character limit of 28 for the branch subdomain, as well as some other heuristics, described here for the sake of implementation ease in deploy-preview.yml, that algo has been omitted. The URLs are logged in the wrangler output, but it's hard to get outputs from a matrix job. ↩