Add the ability to define an issue/MR event and an action to take as a result of that event

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Problem To Solve

Users want more automation in the product such as automatically removing a label when an issue is closed.

Context

One could argue that adding a configuration to a label (#17461) is the MVC solution for this, but that approach is nearsighted given our longer term goals of more complex automation rules in GitLab

Proposal

• Introduce an "Automations" tab into the sidebar
• Provide the ability to create a new automation rule where the user selects an object (Issue only for MVC), an event (Issue Closed/Open only for MVC), and an action to take (add/remove Labels, set assignee, and so on)

Testing

• Absolutely

Tier

• ~"GitLab Core"
• We will figure out how monetize various aspects of Automations down the road