chore: use MockK instead of Mockito for in-app messages tests

[mrehan27]

part of: MBL-377

Changes

• Moved messaginginapp tests from sharedTest package to test package for convenience
• Updated messaginginapp tests to use MockK instead of Mockito and EventBus for hooks
• Moved UnitTestLogger to the commontest module for reuse
• Fixed EventBus scope for tests
• Added UnitTest and JUnitTest classes to messaginginapp tests for more convenient test writing
• Minor fixes in related code

[github-actions[bot]]

# Sample app builds 📱 Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request. --- * java_layout: `rehan/mbl-377-inapp-tests (1719256286)` * kotlin_compose: `rehan/mbl-377-inapp-tests (1719256278)`

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.90%. Comparing base (edbbee9) to head (38d3670).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## rehan/mbl-377-inapp-config #364 +/- ## =========================================================== Coverage 90.90% 90.90% =========================================================== Files 1 1 Lines 11 11 Branches 2 2 =========================================================== Hits 10 10 Misses 1 1 ```

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[github-actions[bot]]

Build available to test Version: rehan-mbl-377-inapp-tests-SNAPSHOT Repository: https://s01.oss.sonatype.org/content/repositories/snapshots/

[github-actions[bot]]

📏 SDK Binary Size Comparison Report

No changes detected in SDK binary size ✅