Use reactive caching for ZenTao issue views

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Background

The following discussion from !69602 (merged) should be addressed:

• @smcgivern started a discussion: (+8 comments)

  Do we want to cache these responses? This could be a case for https://docs.gitlab.com/ee/development/reactive_caching.html

Proposal

Use reactive caching for externally loaded ZenTao issues.

We plan to do something similar for the Jira integration: #218645