refactor: regroup swift test suite

[nickolas-dimitrakas]

Background

• This change focuses on improving clarity and consistency for future development and testing.

What Has Changed

• Restructured the test suite into logical groups based on functionality.
• Moved Objective-C and Swift tests into dedicated parent folders.

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-475

[denischilik]

LGTM