fix(template): refactor and split code for test helper

[BibiSebi]

What?

In this PR, I have refactored and separated the test helper PoC code into a separate file. I used the first approach #307 as it was easier to split.

Once the PR #313 is merged, I will continue with the following next steps:

• [ ] 1. Move test utility function into its own package under packages/helpers/test
• [ ] 2. Add the test inside field-plugin exports in package.json
• [ ] 3. Publish new field-plugin version
• [ ] 4. Create tests for react, vue 3 and vue 2 templates with the new field-plugin version
• [ ] 5. Add a new CI step to run tests after the build

Why?

EXT-2078

How to test? (optional)

1. Run yarn install
2. Run yarn test:template react

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Name	Status	Preview	Comments	Updated (UTC)
plugin-sandbox	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 20, 2023 1:20pm

[BibiSebi]

Current dependencies on/for this PR:

• main
  • PR #304
  • PR #307
    • PR #320
    • PR #316
    • PR #317 👈

This stack of pull requests is managed by Graphite.