Feature toggle for organic adoption experiment

[alevindecanini]

Issue Description

As part of the organic adoption experiment, we need to add a feature toggle in order to be able to 1) show the features to a limited set (10%) of users, and 2) turn the features on and off (or roll back, if needed) according to the experiment plan.

Flipper gem details

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Tasks

• Research Flipper gem
• Build toggle
• Deploy in staging & prod to our team only (list of emails) for testing purposes

Acceptance Criteria

• All experiment components can be toggled as a set
• Toggling is done manually
• 10% of users are targeted

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How to configure this issue

• Attached to a Milestone (when will this be completed?)
• Attached to an Epic (what body of work is this a part of?)
• Labeled with Team (product support, analytics-insights, operations, service-design, Console-Services, tools-fe)
• Labeled with Practice Area (backend, frontend, devops, design, research, product, ia, qa, analytics, contact center, research, accessibility, content)
• Labeled with Type (bug, request, discovery, documentation, etc.)

[holytoastr]

Added me, Ksenia, and Anthony as initial users with access to toggle control ui. Can add more if given list of who should be included.