fix: change item_date to convert to site timezone on import

[preda-bogdan]

Summary

Fix item date import to respect timezone settings. Added unit test to validate item import date based on the timezone settings.

Will affect the visual aspect of the product

NO

Screenshots

UTC

  

UTC +2

  

Test instructions

1. On a fresh instance with Feedzy.
2. Set the Timezone from Settings > General to a desired locale.
3. Create a new import where we map the #item_date.
4. Import a feed, and check that the imported items are offset correctly on import based on

Check before Pull Request is ready:

• [x] I have written a test and included it in this PR
• [x] I have run all tests and they pass
• [x] The code passes when running the PHP CodeSniffer
• [x] Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• [x] Security and Sanitization requirements have been followed
• [x] I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #832.

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[irinelenache]

@preda-bogdan Tested and everything's fine here ✔️

[pirate-bot]

:tada: This PR is included in version 4.4.9 :tada:

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