Adds backward compatibility for WC 6.1, 6.2, 6.3. (#2362)

[ibndawood]

Changes proposed in this Pull Request:

Closes #2362 .

This PR implements the get_parent_id method in the Setup Task class as it is declared as abstract in WooCommerce versions mentioned.

• Do the changed files pass phpcs checks? Please remove phpcs:ignore comments in changed files and fix any issues, or delete if not practical.

Detailed test instructions:

1. Install and activate WooCommerce 6.2.
2. Install this PR and verify the task Setup Facebook for WooCommerce is displayed properly in WooCommerce > Home.
3. Update WooCommerce to version 7.1
4. Verify the task Setup Facebook for WooCommerce is displayed properly in WooCommerce > Home.

Additional details:

Changelog entry

Fix - Add backward compatibility for WC 6.1, 6.2, and 6.3 versions.