Experiment Cleanup: Add reassurance to the trial flow - design 1

Summary

This is a placeholder issue for the experiment: Add reassurance to the trial flow - design 1. This experiment has not run yet and thus we do not know the results. We will update this issue when we have the results of the experiment.

When we do pick up this cleanup work we should also include this issue as part of the cleanup work #335548 (closed)

Steps

Determine whether the feature should apply to SaaS and/or self-managed
Determine whether the feature should apply to EE - and which tiers - and/or Core
Determine if tracking should be kept as is, removed, or modified.
Ensure any relevant documentation has been updated.
Consider changes to any feature_category: introduced by the experiment if ownership is changing (PM for Growth and PM for the new category as DRIs)
Optional: Migrate experiment to a default enabled feature flag for one milestone and add a changelog. Converting to a feature flag can be skipped at the ICs discretion if risk is deemed low with consideration to both SaaS and (if applicable) self managed
In the next milestone, remove the feature flag if applicable
After the flag removal is deployed, clean up the feature/experiment feature flags by running chatops command in #production channel
Ensure the corresponding Experiment Tracking issue is updated