Add timeout handling for release evidence workers

What does this MR do and why?

Made minor changes to improve performance in release evidence workers by:

- Caching attributes like sha and tag as well the latest Pipeline if it it exists - Use a read replica instead of chance for primary as per this doc

• Changed the data_consistency to sticky to automatically use read replicas
• Added exception handling around processing releases with next so we continue after any failures
  • To capture better logs if this occurs in the future, as the previous Sentry linked logs are broken.

References

• Issue#427833
• https://docs.gitlab.com/ee/development/merge_request_concepts/performance.html#use-read-replicas-when-possible

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