Follow up task related to: T316079: Bump threshold for confidence score on link recommendation service suggestions

Write a maintenance script to analyze the cached link recommendation contents, which we can then re-use for improved monitoring in T278083: Define SLIs/SLOs for link recommendation service.

User story & summary:

As the Growth team, I want to analyze cached link recommendations, so that I can set up better monitoring and SLOs.

Acceptance Criteria:

TBD: To be set by Growth team engineers.