Convert block templates tests to parametized tests

[Aljullu]

Changes proposed in this Pull Request:

As done in #43650, this PR converts user-customization tests for block templates into parametized tests, which helps reduce code repetition a lot.

How to test the changes in this Pull Request:

Note: no need to test this for the release.

1. Verify Playwright e2e tests pass.

Changelog entry

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Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

Message

Comment

Convert block templates tests to parametized tests

[github-actions]

Test Results Summary

Commit SHA: 1f960e0

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 37s
E2E Tests	265	0	0	18	0	283	5m 31s

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To view the full API test report, click here.
To view the full E2E test report, click here.
To view all test reports, visit the WooCommerce Test Reports Dashboard.

[github-actions]

Hi @albarin,

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[albarin]

👌