Rollout shimo_integration feature flag

Baodongrequested to merge
gitlab-jh/jh-team/gitlab:rollout-shimo_integration into master

Related rollout issue: #345356 (closed)

What does this MR do and why?

Rollout shimo_integration feature flag to turn on it by default.

cc JH EM @prajnamas

Edited by Baodong

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