Improve Code Coverage % for Legal-core

Description:

• Issue Reference: osdu/platform/ci-cd-pipelines#40
• Added junit-vintage-engine dependency to fix the legal-core test execution and jacoco report generation
• Added missing test case scenarios/branches for many units
• Created new Test class for InfoController, Country, GlobalOtherExceptionMapper, LegalTagRepositoryFactoryImpl, DefaultRule, ExpiredContractRule, RulesetProvider
• Added 'jacoco-maven-plugin' configuration exclusion list [SwaggerDoc class & GlobalErrorHandler (hidden) controller]
• Added lombok.config to exclude Lombok generated methods from coverage
• refactored the existing test cases naming conventions(should_when)
• formatted the test cases w.r.t Arrange Act Assert [AAA] pattern
• Core Code Coverage Job added and Latest Code Coverage Report