Scope agent_plan FF check to root ancestor
What does this MR do and why?
Anchor the agent_plan feature flag check to the root ancestor of the
resource_parent instead of the resource_parent itself.
Before, the flag was checked against the resource_parent directly,
which would have rolled the feature out per project or per group. With
this change, enabling the flag on a top-level group propagates the
widget to every container underneath it.
References
https://gitlab.com/gitlab-org/gitlab/-/work_items/598408+
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