Add permission verification test for issue #70

[Copilot]

This PR adds a simple test to verify that repository write permissions are working correctly. The test was requested as part of issue #70 to validate that changes can be made to the repository.

Changes Made

1. Added PermissionVerificationTest.java in testing-common/src/test/java/io/opentelemetry/instrumentation/testing/junit/

   • Contains two basic JUnit 5 tests that verify fundamental functionality
   • Follows existing project conventions and structure
   • Includes clear documentation indicating it can be safely removed after verification

2. Updated .gitignore to exclude **/.kotlin/ build artifacts that were being generated during the build process

Verification

The test successfully:

• Compiles with the existing build system
• Runs using the standard gradle test runner
• Demonstrates that repository write permissions are functioning properly

This is a minimal, safe change that can be easily identified and removed once permission verification is complete.

Fixes #70.

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