fix: add parent property to avoid dynamic property

[MaferMazu]

Description

Adds "parent" property to avoid dynamic property creation.

This solves #106

Details

We were assigning a value to a property called "parent"

openedx-wordpress-ecommerce/includes/model/class-openedx-commerce-enrollment.php

Line 58 in e0e636e

$this->parent = $parent_name;

but it wasn't defined before.

In this PR, I only define a property called "parent" to avoid the dynamic property creation.

And also update the tested up version in the docs.

Testing instructions

Live link: https://openecommtest.s6-tastewp.com/wp-admin/
I already uploaded the plugin with this version.

Credentials

admin

P^C)W)DOrPa&^KYsOvY8x2P3

Or you can use this branch to run make release, and compress the openedx-commerce folder as a ZIP file. Use that as a plugin to upload to your WordPress environment, and you can also upload to the test live site.

Everything should work as expected.

Additional information

Before the PR

https://github.com/openedx/openedx-wordpress-ecommerce/actions/runs/12168160490/job/34157245826?pr=104

After the PR

https://github.com/openedx/openedx-wordpress-ecommerce/actions/runs/13681127038/job/38253515240?pr=109

Checklist for Merge

• Tested in a remote environment
• Updated documentation (NA)
• Rebased master/main
• Squashed commits

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[felipemontoya]

I was about to fix this in #111. So I'll merge here