Update Experiment cleanup issue to consider surprising user experiences

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Created from gitlab-org/growth/team-tasks#905 (comment 2690323983)

We should add consideration for the user experience if when they are pushed into a different experience than they were originally. i.e. control vs experiment that cleanup/full enabling/disabling could cause.

We can likely handle this in the experiment cleanup issue template. See ideas in gitlab-org/growth/team-tasks#905 (comment 2851221661) and rest of thread.