Remove hidden_notes feature flag
What does this MR do and why?
Removes the hidden_notes feature flag as it is now enabled across all environments.
I also verified the feature flag status for self-managed customers using the Tableau dashboard and did not find any instance where the flag is disabled.
Dashboard link: Tableau - Instance Feature Flags
References
Screenshots or screen recordings
| Before | After |
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How to set up and validate locally
MR acceptance checklist
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Related to #520686 (closed)
Edited by Ayush Billore