Enable branch rules feature flag by default
What does this MR do and why?
Enables branch_rules feature flag by default and updates documentation accordingly.
How to set up and validate locally
- Navigate to Project > Settings > Repository
- The Branch rules section should be available and working as expected
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #363170 (closed)