Add intended rollout date for branch_list_keyset_pagination feature flag
What does this MR do and why?
Add intended_to_rollout_by: "2025-11-01" to prevent automated removal by housekeeper tool.
Context
- Feature flag rollout was paused due to incident #369435 (comment 2560116285)
- Setting Q3 2025 target to align with bug backlog cleanup priorities
- This prevents the housekeeper from flagging this FF for removal
Changes
- Added
intended_to_rollout_byfield to feature flag YAML configuration
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