Add rake task to cleanup description templates cache in batches

What does this MR do?

This MR takes a rake task code and moves into a service that can be reused in the rake tasks, or other parts of the code. The goal was to provide a way to mass reset description template names cache for #322078 (closed)

#322078 (closed) was eventually fixed in a different way which in essence involves cache reset as well, but simply by changing cache keys and leaving the old keys to expire based on gitlab general TTL which is 2 weeks.

This MR provides a way to mass expire cache keys in batches.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability 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
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

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