[Rule Form V2] Action Connector Form for Rule Form V2

[JiaweiWu]

Parent Issue: #175634

Protoype: https://www.figma.com/proto/y6UZVXzF9IrKdYIjx9L2ax/Create-Rule-Flow-MS2?page-id=5669%3A627069&type=design&node-id=5669-627072&viewport=16400%2C759%2C1&t=Gj8Zv71Wat3mtN4F-1&scaling=scale-down-width&starting-point-node-id=5683%3A736578&show-proto-sidebar=1

Description

The goal for this ticket is to create the action form for the new rule form V2. We will create new components for the new action creation form. This will help us in the future to have more maintainable code as the code right now is hard to reason about. Our strategy for pull requests is to have multiple PRs with individual components that can be merged separately.

Requirements (Definition of done):

• Users can select actions in the new rule form
• Users can create rules with the selected action
• Users can edit rules to add or remove actions
• No breaking changes for existing action creation logic
• Refactor old action creation logic to be more easily reasoned about

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[cnasikas]

Implemented by #187434.