[RUN AS-IF-FOSS] Move cluster health metrics dashboard serivces into gitlab core

What does this MR do?

This MR is a step towards moving cluster health dashboard into gitlab core #208224 (closed). It is focused on moving files in services, lib and config directories out of ee namespace. Some of those files may contain dead code, but to clean it up properly it will require additional effort which can be delivered as follow up issue #225869 (closed) Because controller layer is still untouched this change can be labeled as ~backstage therefore I've not included changelog nor, documentation update.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

- [ ] Changelog entry

- [ ] Documentation (if required)

• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content