Code refactor, updated Unit Test with JsonHexTag Serializer

[srsathish92]

Description (*)

This PR helps to refactor the code of Block/Cart/Shipping in Checkout Module, utilised JsonHexTag class for replacing PHP json_encode with JsonHexTag option, Also covered the unit test case with JsonHexTag class & data provider.

Path: app/code/Magento/Checkout/Block/Cart/Shipping.php

Manual testing scenarios (*)

vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist app/code/Magento/Checkout/Test/Unit/Block/Cart/ShippingTest.php

Questions or comments

If any please let me know your feedback

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 are green)

[m2-assistant]

Hi @srsathish92. Thank you for your contribution
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[magento-engcom-team]

Hi @lbajsarowicz, thank you for the review.
ENGCOM-6514 has been created to process this Pull Request
✳️ @lbajsarowicz, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Delta]

✔️ QA passed

[srsathish92]

@lbajsarowicz can you please add the labels.

[lbajsarowicz]

Added Test coverage

[m2-assistant]

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