Test Cases for agents-common Module: Packages (plugin.service, plugin.store)

[RakeshGuptaDev]

What changes were proposed in this pull request?

AI Disclosure

Added AI-generated Test methods/Test classes using Cursor AI for Common library for Plugins module and manually reviewed.

Added unit test cases for agents-common module

How was this patch tested?

Build completed successfully along with all test cases using the command: mvn clean compile package install.

As per Jacoco Apache -> Common library for Plugins

Packages Covered

Improved Jacoco coverage across multiple packages: org.apache.ranger.plugin.service → 33% → 76% org.apache.ranger.plugin.store → 1% → 85%