Add rake task to cleanup description templates cache

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

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Availability and Testing

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

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