[ECP-9884] Fix the missing references in TransportBuilder class

[candemiralp]

Description

This PR fixes the missing references for the constants related to Mime class in TransportBuilder class. The required references have been removed as a part of Magento 2.4.8 backward incompatible changes. Therefore, they need to be replaced with the correct reference.

Fixes #3208

[gemini-code-assist]

Summary of Changes

Hello @candemiralp, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a backward incompatibility introduced in Magento 2.4.8 by updating the TransportBuilder class to use the correct Mime constant references. This change ensures that email attachment functionality continues to operate as expected by replacing outdated Laminas\Mime\Mime constants with their MimeInterface equivalents, and the corresponding unit tests have been adjusted to reflect this change.

Highlights

• Dependency Update: The Laminas\Mime\Mime class import has been removed from Model/TransportBuilder.php.
• Mime Constant References: References to Mime constants within the prepareAttachmentPart method in Model/TransportBuilder.php have been updated from Mime::* to MimeInterface::* to align with Magento 2.4.8 backward incompatible changes.
• Unit Test Adjustment: The unit test Test/Unit/Model/TransportBuilderTest.php has been modified to remove the conditional markTestSkipped block that checked for the existence of the Laminas\Mime\Mime class, reflecting the updated dependency.

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[gemini-code-assist]

Code Review

This pull request correctly addresses a backward-incompatible change from Magento 2.4.8 by replacing deprecated constants from Laminas\Mime\Mime with the correct ones from Magento\Framework\Mail\MimeInterface in the TransportBuilder class. The changes are accurate and also include updating the unit test to remove the now-unnecessary dependency check. The implementation is clean and effectively resolves the issue. The code looks good, and I have no suggestions for improvement.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud