Break down create-variable-product spec into smaller files

[rodelgc]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

This PR breaks down the huge create-variable-product spec into separate, more focused spec files. This would help in avoiding and troubleshooting flakiness in the future.

These specs are placed inside the new plugins/woocommerce/tests/e2e-pw/tests/merchant/products/add-variable-product/ folder as an initial step to group related specs together according to the critical flows they test.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

Code review

1. Make sure that none of the tests from the original create-variable-product spec got lost during the restructure.
2. Make sure that the new specs do not use the deprecated page methods.

Test locally

1. Run the setup commands for launching the local environment.
2. cd into the plugins/woocommerce folder.
3. Run the new specs in the add-variable-product folder. They should pass.

   pnpm test:e2e-pw add-variable-product

4. Run the entire merchant E2E tests to see if the new specs conflict with any of the merchant tests.

   pnpm test:e2e-pw tests/e2e-pw/tests/merchant

Test on CI

1. Rerun the E2E tests on CI a few times to make sure no flakiness were added.

[github-actions]

Test Results Summary

Commit SHA: 34dd147

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	267	0	0	2	0	269	1m 10s
E2E Tests	194	0	0	10	0	204	15m 47s

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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.

[codecov]

Codecov Report

Merging #38335 (34dd147) into trunk (e077c4c) will not change coverage.
The diff coverage is 66.7%.

Additional details and impacted files

@@           Coverage Diff            @@
##             trunk   #38335   +/-   ##
========================================
  Coverage     51.6%    51.6%           
  Complexity   17444    17444           
========================================
  Files          440      440           
  Lines        80297    80297           
========================================
  Hits         41401    41401           
  Misses       38896    38896           

Impacted Files	Coverage Δ
plugins/woocommerce/includes/class-woocommerce.php	20.0% <0.0%> (ø)
...cludes/data-stores/class-wc-webhook-data-store.php	78.5% <80.0%> (ø)

[github-actions]

Hi , @woocommerce/solaris

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

[nigeljamesstevenson]

Looks great @rodelgc - thanks a lot for this! Fingers crossed this resolves a lot of the flakiness going forward 🤞