refactor: follow proper swift test naming

[nickolas-dimitrakas]

Background

• The Swift test suite contained inconsistent naming conventions, making it harder to identify test purpose and maintain readability.
• This change standardizes all test names to follow Swift and XCTest best practices.

What Has Changed

• Renamed all Swift test functions to follow a consistent convention:
  test_<methodUnderTest>_<expectedBehavior>_<condition>

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://rokt.atlassian.net/browse/SDKE-476

[denischilik]

LGTM