SK-2430: Add unit tests for detokenization UDF

[saileshwar-skyflow]

Why

• Current test coverage for the Hive detokenization UDF is low. More tests are needed to properly validate the functionality and make it reliable.

Outcome

• Coverage will increase to around 80% and will be tracked through Codecov for visibility and future improvements.

[Copilot]

Pull request overview

This PR enhances test coverage for the Hive detokenization UDF by adding comprehensive unit tests across validation, helper, configuration, and main UDF classes. The goal is to increase coverage to approximately 80% and integrate code coverage tracking via JaCoCo.

• Added unit tests for Validations, Helper, Config, and DetokenizeUDF classes
• Integrated JaCoCo plugin for code coverage reporting
• Added GitHub Actions workflow for automated coverage tracking

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
hive/detokenization/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker	Enables inline mocking for Mockito to support mocking of final classes
hive/detokenization/src/test/java/com/skyflow/hive/utils/ValidationsTest.java	New comprehensive test suite for validation logic including session state, config, credentials, and file path validation
hive/detokenization/src/test/java/com/skyflow/hive/utils/HelperTest.java	Extended test coverage for helper utilities including credentials file and vault URL initialization scenarios
hive/detokenization/src/test/java/com/skyflow/hive/utils/ConfigTest.java	Migrated from JUnit 4 to JUnit 5 and added tests for partial field deserialization and getters
hive/detokenization/src/test/java/com/skyflow/hive/DetokenizeUDFTest.java	Enhanced UDF tests with success/failure scenarios, mocking improvements, and null input handling
hive/detokenization/src/main/java/com/skyflow/hive/utils/Validations.java	Added explicit exception handling to preserve UDFArgumentException in catch blocks
hive/detokenization/pom.xml	Added JaCoCo Maven plugin configuration for coverage reporting
.github/workflows/detokenization-coverage.yml	New CI workflow for running tests and uploading coverage reports

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