Move from Java to Kotlin in collaborator tests

[josdem]

As developer, I want to use Kotlin instead of Java in unit and integration tests cases under package collaborator so that I can improve the code.

Acceptance Criteria

• All tests in package com.josdem.jmatadata.collaborator are in Kotlin language
• We are using TestInfo in all test methods
• We are importing org.junit.jupiter.api.AssertionsEquals and similar
• All tests passing

References

• https://kotlinlang.org/docs/jvm-test-using-junit.html