Creates destroy cluster service

What does this MR do?

This MR is part of the implementation that we're splitting from this MR which got too big: !16954 (merged). Note: For this reason I didn't add a changelog

This part of the code creates a destroy service that will either destroy the service or transition the Clusters::Cluster#cleanup_status state machine via the the start_cleanup! transition method, depending if the cleanup request param is truthy.

Although, the state machine logic was also split into another MR which needs to be merged first: !18144 (merged)

Related issue: #26815 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team