tests(react-router): add some basic runtime tests for `Link`

[chorobin]

Again quite high level to test navigation and not internals. I will add some more but wanted to know if you guys are ok with basic high level tests like this

[nx-cloud[bot]]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit e73be4ca631c3c6d0a9baa4e4e22cb99ca1f6217. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

---

✅ Successfully ran 2 targets

• nx affected --targets=test:format,test:eslint,test:unit,test:build,build --parallel=3
• nx affected --target=test:types --exclude=examples/**

---

Sent with 💌 from NxCloud.