Add experiment tracking for the control assignment event

What does this MR do and why?

References

Add experiment tracking for the control assignment event to mirror the candidate flow.

Screenshots or screen recordings

n/a

How to set up and validate locally

  1. Setup to Simulate SaaS and restart GDK
  2. Also make sure snowplow-micro is running
  3. If logged in, log out
  4. Enable the experiment feature flag in the console: Feature.enable(:lightweight_trial_registration_redesign)
  5. Go to /-/trial_registrations/new and complete the trial registration flow.

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Related to #543761

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