[Frontend] Add humanisation rules for new policy type

Why are we doing this work

Policy drawer has to reflect new policy type consistent with existing types

Policy rules should convert rule object to humanly-readable sentence

Relevant links

Design: #452328[list_view-with_drawer.png]

Non-functional requirements

• Documentation:
• Feature flag: pipeline_execution_policy_type
• Performance:
• Testing: unit tests

Implementation plan

1. Create new utils.js for pipeline_execution_policy_type in security_orchestration/components/policy_drawer/new_policy_folder
2. Add methods to covert rule objects to humanly-readable sentence
3. Update details_drawer.vue to use this utils methods and make sure Summary section is displayed properly.