Adding Acceptance tests

• Created a new module partition-acceptance-test
• Copy of core test cases to new module.
• Made test classes final forbidding overrides.
• Decouple provider modules from a core-test module. (By moving the refactored module to a new folder)
• Added a common, standards-based configuration for token issuing. (OIDC and direct token injection)
• Added new acceptance job.
• Tests have been updated according to the OpenAPI spec.