When users rename an existing branch protection rule, a new rule with the new name will be created and the old rule will still exist.  ---  The reason is that the `SettingsProtectedBranchPost` function only get branch protection rule by name before updating or creating a rule. When the rule name changes, the function cannot find the existing rule so it will create a new rule rather than update the existing rule. To fix the bug, the function should get rule by id first. --------- Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
