Fix issue 19887 creating new shipment: getting all trackers.

[Nazar65]

Description (*)

After creating new shipment customer receive email with all my tracking number

Fixed Issues (if relevant)

1. creating new shipment: gettting all trackers. after this commit 2307e16 #19887: Issue title

Manual testing scenarios (*)

1. after creating new shipment and exec $_shipment->getAllTracks()
2. in https://example.com/admin_xxxxx/admin/order_shipment/view/shipment_id/382
3. after tick Notify Customer by Email and click save
4. the customer receive email with all my tracking number

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @Nazar65. Thank you for your contribution
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[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-3755 has been created to process this Pull Request

[ghost]

Hi @Nazar65, thank you for your contribution!
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[magento-engcom-team]

Hi @Nazar65. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.

[magento-engcom-team]

Hi @Nazar65. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.

[apedicdev]

getTracksCollection () doesn't accept argument, does it?