Fixing: UPS single rate not displayed #39408

[CptCharlesG]

Description (*)

In case there is only 1 rate available, then UPS returns a singe rate alone, not in an array of rates.
This logic checks if the details of the rate is exposed directly, and wraps it in an array to be compatible with the rest of the code.

Fixed Issues (if relevant)

1. Fixes UPS single rate not displayed #39408

Manual testing scenarios (*)

1. Set the country of the system/seller/origin to Hungary.
2. Request rate for Cyprus 3030.

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)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[CptCharlesG]

@magento run all tests

[CptCharlesG]

@magento run all tests

[CptCharlesG]

@magento run all tests