test: use random available port for e2e tests

[BobbieGoede]

It took me a while to realize that the e2e tests were failing for me locally due to the :8080 port already being in use, this PR changes the port selection to use an available port similar to how we set up tests in Nuxt projects.

[pkg-pr-new]

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commit: 5f031ef

[kazupon]

Great work!
Thanks!