Deprecate Shimo and ZenTao integrations
What does this MR do and why?
This MR deprecates the Shimo and ZenTao integrations. I'll open a follow-up MR in the gitlab-docs repo to add (deprecated) to the two navigation entries.
Related issues
Related guidance
https://docs.gitlab.com/ee/development/documentation/versions.html#deprecate-a-page-or-topic
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MR acceptance checklist
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