Handle duplicate branches in schedule pipeline form

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The following discussion from !184694 (merged) should be addressed:

• @arfedoro started a discussion:

  question (non-blocking) ❓

  What do you think about handling duplicates in a follow-up?

Implementation

• frontend handle duplicate branches or branches && branch_type added in ee/app/assets/javascripts/security_orchestration/components/policy_editor/pipeline_execution/rule/schedule_form.vue