[GTIN] Add GTIN migration JOB

[puntope]

Changes proposed in this Pull Request:

Closes part of #2616 as part of pcTzPl-2p2-p2.

This PR creates the logic for the Job responsible for the migration GTIN in batches for all the products.

Screenshots:

Detailed test instructions:

1. Set a simple product and add a GTIN in Google for WooCommerce tab
2. Set a simple product and add a different GTIN in Google for WooCommerce tab and in the Inventory tab
3. Set a Variable product and set GTIN on one of the variations in Google for WooCommerce only and in both (inventory and Google for WooCommerce) in other.
4. Go to Connection Test page and click on "Start GTIN Migration"
5. See the job gla/jobs/migrate_gtin/create_batch scheduled in WooCommerce - Status - Scheduled actions
6. Run the job and see the gla/jobs/migrate_gtin/process_items created with the product ids.
7. Run it
8. Go back to the products created in steps 1,2,3 and verify that:
9. For the product in step 1- the GTIN was loaded in the inventory GTIN
10. For the product in step 2 - The GTIN is still the GTIN you set initially and is not override by the GTIN in google for WooCommerce GTIN
11. Check the same in the variations (GTIN set in core should not be overrided in the migration).

Additional details:

In follow-up PRs I will add:

• the banners for starting the migration
• tests
• WP CLI tool

Changelog entry

Add - Add GTIN Migration Job

[puntope]

I noticed a different behavior for simple products when the GTIN is already set to the same value or when it's set to a different one. Is that expected? if there are differences, it keeps the core GTIN but adds the G4W as SKU, while for the case where they're the same, it does not set SKU.

Hey @tomalec that's odd I was not able to reproduce this. Can you verify again or help me to reproduce this issue?

The expected behaviour is:

• If GTIN is set in the inventory tab then migration does nothing.
• If GTIN is not set in the inventory tab then migration loads the GTIN set in Google for WooCommerce tab (if it is set)

[puntope]

Plus, for variable ones, it didn't migrate the GTINs. The process job was executed.

The variables are required to process the Variations. I just added a tweak here because I notice I was processing only available variations (those with price set) Now I do get all the variations.

Notice the GTIN in the variable inventory is useless because we don't support GTIN in Variables. So you need to check each of the variations (they have their own GTIN fields in core part and G4W tab) .

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 38 lines in your changes missing coverage. Please review.

Project coverage is 65.4%. Comparing base (a2c3654) to head (02e6224). Report is 10 commits behind head on add/support-core-gtin-field.

Files with missing lines	Patch %	Lines
src/Jobs/MigrateGTIN.php	0.0%	27 Missing :warning:
src/ConnectionTest.php	0.0%	6 Missing :warning:
...ternal/DependencyManagement/JobServiceProvider.php	0.0%	5 Missing :warning:

Additional details and impacted files

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[puntope]

Hey @tomalec I addressed all your comments and questions. Can you follow up with another review?