feat(template): setup test for vue3 template

[eunjae-lee]

What?

This PR adds a basic test setup to vue3 template.

Why?

JIRA: EXT-2079

How to test? (optional)

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Name	Status	Preview	Comments	Updated (UTC)
plugin-sandbox	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 6, 2023 10:06am

[eunjae-lee]

Current dependencies on/for this PR:

• main
  • PR #327 👈
  • PR #328

This stack of pull requests is managed by Graphite.

[eunjae-lee]

Merge activity

• Dec 6, 11:12 AM: @@eunjae-lee started a stack merge that includes this pull request via Graphite.
• Dec 6, 11:13 AM: @@eunjae-lee merged this pull request with Graphite.